Merge Image and Canvas GL backend classes into new common Texture class.

src/modules/font/GlyphData.cpp

@@ -78,7 +78,7 @@ void *GlyphData::getData() const
 
 size_t GlyphData::getPixelSize() const
 {
-	return getPixelFormatSize(format);
+	return getPixelFormatBlockSize(format);
 }
 
 void *GlyphData::getData(int x, int y) const

src/modules/graphics/Font.cpp

@@ -158,7 +158,7 @@ void Font::createTexture()
 	texture->setSamplerState(samplerState);
 
 	{
-		size_t bpp = getPixelFormatSize(pixelFormat);
+		size_t bpp = getPixelFormatBlockSize(pixelFormat);
 		size_t pixelcount = size.width * size.height;
 
 		// Initialize the texture with transparent white for Luminance-Alpha

src/modules/graphics/Texture.cpp

@@ -184,6 +184,9 @@ Texture::Texture(const Settings &settings, const Slices *slices)
 	{
 		texType = slices->getTextureType();
 
+		if (requestedMSAA > 1)
+			throw love::Exception("MSAA textures cannot be created from image data.");
+
 		int dataMipmaps = 1;
 		if (slices->validate() && slices->getMipmapCount() > 1)
 			dataMipmaps = slices->getMipmapCount();
@@ -218,7 +221,7 @@ Texture::Texture(const Settings &settings, const Slices *slices)
 	if (settings.readable.hasValue)
 		readable = settings.readable.value;
 	else
-		readable = !isPixelFormatDepthStencil(format);
+		readable = !renderTarget || !isPixelFormatDepthStencil(format);
 
 	format = gfx->getSizedFormat(format, renderTarget, readable, sRGB);
 
@@ -234,6 +237,9 @@ Texture::Texture(const Settings &settings, const Slices *slices)
 	if (texType != TEXTURE_2D && requestedMSAA > 1)
 		throw love::Exception("MSAA is only supported for textures with the 2D texture type.");
 
+	if (!renderTarget && requestedMSAA > 1)
+		throw love::Exception("MSAA is only supported with render target textures.");
+
 	if (readable && isPixelFormatDepthStencil(format) && settings.msaa > 1)
 		throw love::Exception("Readable depth/stencil textures with MSAA are not currently supported.");
 
@@ -269,7 +275,7 @@ Texture::Texture(const Settings &settings, const Slices *slices)
 		throw love::Exception("%s textures are not supported on this system.", textypestr);
 	}
 
-	validateDimensions(!renderTarget);
+	validateDimensions(renderTarget || !readable);
 
 	samplerState = gfx->getDefaultSamplerState();
 
@@ -619,8 +625,11 @@ int Texture::getRequestedMSAA() const
 
 void Texture::setSamplerState(const SamplerState &s)
 {
-	if (s.depthSampleMode.hasValue && (!readable || !isPixelFormatDepthStencil(format)))
-		throw love::Exception("Only readable depth textures can have a depth sample compare mode.");
+	if (!readable)
+		return;
+
+	if (s.depthSampleMode.hasValue && !isPixelFormatDepth(format))
+		throw love::Exception("Only depth textures can have a depth sample compare mode.");
 
 	Graphics::flushStreamDrawsGlobal();
 

src/modules/graphics/Texture.h

@@ -164,7 +164,7 @@ public:
 		PixelFormat format = PIXELFORMAT_NORMAL;
 		bool linear = false;
 		float dpiScale = 1.0f;
-		int msaa = 0;
+		int msaa = 1;
 		bool renderTarget = false;
 		OptionalBool readable;
 	};

src/modules/graphics/Video.cpp

@@ -90,7 +90,7 @@ Video::Video(Graphics *gfx, love::video::VideoStream *stream, float dpiscale)
 
 		tex->setSamplerState(samplerState);
 
-		size_t bpp = getPixelFormatSize(PIXELFORMAT_R8_UNORM);
+		size_t bpp = getPixelFormatBlockSize(PIXELFORMAT_R8_UNORM);
 		size_t size = bpp * widths[i] * heights[i];
 
 		Rect rect = {0, 0, widths[i], heights[i]};
@@ -167,7 +167,7 @@ void Video::update()
 
 		for (int i = 0; i < 3; i++)
 		{
-			size_t bpp = getPixelFormatSize(PIXELFORMAT_R8_UNORM);
+			size_t bpp = getPixelFormatBlockSize(PIXELFORMAT_R8_UNORM);
 			size_t size = bpp * widths[i] * heights[i];
 
 			Rect rect = {0, 0, widths[i], heights[i]};

src/modules/graphics/opengl/Graphics.cpp

@@ -132,10 +132,7 @@ love::graphics::StreamBuffer *Graphics::newStreamBuffer(BufferType type, size_t
 
 love::graphics::Texture *Graphics::newTexture(const Texture::Settings &settings, const Texture::Slices *data)
 {
-	if (settings.renderTarget)
-		return new Canvas(settings);
-	else
-		return new Image(settings, data);
+	return new Texture(settings, data);
 }
 
 love::graphics::ShaderStage *Graphics::newShaderStageInternal(ShaderStage::StageType stage, const std::string &cachekey, const std::string &source, bool gles)
@@ -569,8 +566,7 @@ void Graphics::endPass()
 
 		for (int i = 0; i < (int) rts.colors.size(); i++)
 		{
-			// FIXME
-			Canvas *c = (Canvas *) rts.colors[i].texture.get();
+			Texture *c = (Texture *) rts.colors[i].texture.get();
 
 			if (!c->isReadable())
 				continue;
@@ -588,7 +584,7 @@ void Graphics::endPass()
 
 	if (depthstencil != nullptr && depthstencil->getMSAA() > 1 && depthstencil->isReadable())
 	{
-		gl.bindFramebuffer(OpenGL::FRAMEBUFFER_DRAW, ((Canvas *) depthstencil)->getFBO());
+		gl.bindFramebuffer(OpenGL::FRAMEBUFFER_DRAW, ((Texture *) depthstencil)->getFBO());
 
 		if (GLAD_APPLE_framebuffer_multisample)
 			glResolveMultisampleFramebufferAPPLE();
@@ -613,14 +609,13 @@ void Graphics::endPass()
 
 	for (const auto &rt : rts.colors)
 	{
-		// TODO
-//		if (rt.texture->getMipmapMode() == Canvas::MIPMAPS_AUTO && rt.mipmap == 0)
-//			rt.texture->generateMipmaps();
+		if (rt.texture->getMipmapsMode() == Texture::MIPMAPS_AUTO && rt.mipmap == 0)
+			rt.texture->generateMipmaps();
 	}
 
-//	int dsmipmap = rts.depthStencil.mipmap;
-//	if (depthstencil != nullptr && depthstencil->getMipmapMode() == Canvas::MIPMAPS_AUTO && dsmipmap == 0)
-//		depthstencil->generateMipmaps();
+	int dsmipmap = rts.depthStencil.mipmap;
+	if (depthstencil != nullptr && depthstencil->getMipmapsMode() == Texture::MIPMAPS_AUTO && dsmipmap == 0)
+		depthstencil->generateMipmaps();
 }
 
 void Graphics::clear(OptionalColorf c, OptionalInt stencil, OptionalDouble depth)
@@ -813,7 +808,7 @@ void Graphics::discard(OpenGL::FramebufferTarget target, const std::vector<bool>
 		glDiscardFramebufferEXT(gltarget, (GLint) attachments.size(), &attachments[0]);
 }
 
-void Graphics::cleanupRenderTexture(Texture *texture)
+void Graphics::cleanupRenderTexture(love::graphics::Texture *texture)
 {
 	if (!texture->isRenderTarget())
 		return;

src/modules/graphics/opengl/Graphics.h

@@ -36,8 +36,7 @@
 #include "image/Image.h"
 #include "image/ImageData.h"
 
-#include "Image.h"
-#include "Canvas.h"
+#include "Texture.h"
 #include "Shader.h"
 
 #include "libraries/xxHash/xxhash.h"
@@ -71,7 +70,7 @@ public:
 
 	void draw(const DrawCommand &cmd) override;
 	void draw(const DrawIndexedCommand &cmd) override;
-	void drawQuads(int start, int count, const vertex::Attributes &attributes, const vertex::BufferBindings &buffers, Texture *texture) override;
+	void drawQuads(int start, int count, const vertex::Attributes &attributes, const vertex::BufferBindings &buffers, love::graphics::Texture *texture) override;
 
 	void clear(OptionalColorf color, OptionalInt stencil, OptionalDouble depth) override;
 	void clear(const std::vector<OptionalColorf> &colors, OptionalInt stencil, OptionalDouble depth) override;
@@ -110,7 +109,7 @@ public:
 	Shader::Language getShaderLanguageTarget() const override;
 
 	// Internal use.
-	void cleanupRenderTexture(Texture *texture);
+	void cleanupRenderTexture(love::graphics::Texture *texture);
 
 private:
 

src/modules/graphics/opengl/Image.cpp

@@ -1,296 +0,0 @@
-/**
- * Copyright (c) 2006-2020 LOVE Development Team
- *
- * This software is provided 'as-is', without any express or implied
- * warranty.  In no event will the authors be held liable for any damages
- * arising from the use of this software.
- *
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- *
- * 1. The origin of this software must not be misrepresented; you must not
- *    claim that you wrote the original software. If you use this software
- *    in a product, an acknowledgment in the product documentation would be
- *    appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- *    misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- **/
-
-#include "Image.h"
-
-#include "graphics/Graphics.h"
-#include "common/int.h"
-
-// STD
-#include <algorithm> // for min/max
-
-namespace love
-{
-namespace graphics
-{
-namespace opengl
-{
-
-Image::Image(const Settings &settings, const Slices *data)
-	: love::graphics::Texture(settings, data)
-	, slices(settings.type)
-	, texture(0)
-{
-	if (data != nullptr)
-		slices = *data;
-	loadVolatile();
-}
-
-Image::~Image()
-{
-	unloadVolatile();
-}
-
-void Image::generateMipmaps()
-{
-	if (getMipmapCount() > 1 && !isCompressed() &&
-		(GLAD_ES_VERSION_2_0 || GLAD_VERSION_3_0 || GLAD_ARB_framebuffer_object || GLAD_EXT_framebuffer_object))
-	{
-		gl.bindTextureToUnit(this, 0, false);
-
-		GLenum gltextype = OpenGL::getGLTextureType(texType);
-
-		if (gl.bugs.generateMipmapsRequiresTexture2DEnable)
-			glEnable(gltextype);
-
-		glGenerateMipmap(gltextype);
-	}
-}
-
-void Image::loadDefaultTexture()
-{
-	usingDefaultTexture = true;
-
-	gl.bindTextureToUnit(this, 0, false);
-	setSamplerState(samplerState);
-
-	bool isSRGB = false;
-	gl.rawTexStorage(texType, 1, PIXELFORMAT_RGBA8_UNORM, isSRGB, 2, 2, 1);
-
-	// A nice friendly checkerboard to signify invalid textures...
-	GLubyte px[] = {0xFF,0xFF,0xFF,0xFF, 0xFF,0xA0,0xA0,0xFF,
-	                0xFF,0xA0,0xA0,0xFF, 0xFF,0xFF,0xFF,0xFF};
-
-	int slices = texType == TEXTURE_CUBE ? 6 : 1;
-	Rect rect = {0, 0, 2, 2};
-	for (int slice = 0; slice < slices; slice++)
-		uploadByteData(PIXELFORMAT_RGBA8_UNORM, px, sizeof(px), 0, slice, rect, nullptr);
-}
-
-void Image::loadData()
-{
-	int mipcount = getMipmapCount();
-	int slicecount = 1;
-
-	if (texType == TEXTURE_VOLUME)
-		slicecount = getDepth();
-	else if (texType == TEXTURE_2D_ARRAY)
-		slicecount = getLayerCount();
-	else if (texType == TEXTURE_CUBE)
-		slicecount = 6;
-
-	if (!isCompressed())
-		gl.rawTexStorage(texType, mipcount, format, sRGB, pixelWidth, pixelHeight, texType == TEXTURE_VOLUME ? depth : layers);
-
-	int w = pixelWidth;
-	int h = pixelHeight;
-	int d = depth;
-
-	OpenGL::TextureFormat fmt = gl.convertPixelFormat(format, false, sRGB);
-
-	for (int mip = 0; mip < mipcount; mip++)
-	{
-		if (isCompressed() && (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME))
-		{
-			size_t mipsize = 0;
-
-			if (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME)
-			{
-				for (int slice = 0; slice < slices.getSliceCount(mip); slice++)
-				{
-					auto id = slices.get(slice, mip);
-					if (id != nullptr)
-						mipsize += id->getSize();
-				}
-			}
-
-			if (mipsize > 0)
-			{
-				GLenum gltarget = OpenGL::getGLTextureType(texType);
-				glCompressedTexImage3D(gltarget, mip, fmt.internalformat, w, h, d, 0, mipsize, nullptr);
-			}
-		}
-
-		for (int slice = 0; slice < slicecount; slice++)
-		{
-			love::image::ImageDataBase *id = slices.get(slice, mip);
-			if (id != nullptr)
-				uploadImageData(id, mip, slice, 0, 0);
-		}
-
-		w = std::max(w / 2, 1);
-		h = std::max(h / 2, 1);
-
-		if (texType == TEXTURE_VOLUME)
-			d = std::max(d / 2, 1);
-	}
-
-	if (getMipmapCount() > 1 && slices.getMipmapCount() <= 1)
-		generateMipmaps();
-}
-
-void Image::uploadByteData(PixelFormat pixelformat, const void *data, size_t size, int level, int slice, const Rect &r, love::image::ImageDataBase *imgd)
-{
-	love::image::ImageDataBase *oldd = slices.get(slice, level);
-
-	// We can only replace the internal Data (used when reloading due to setMode)
-	// if the dimensions match.
-	if (imgd != nullptr && oldd != nullptr && oldd->getWidth() == imgd->getWidth()
-		&& oldd->getHeight() == imgd->getHeight())
-	{
-		slices.set(slice, level, imgd);
-	}
-
-	OpenGL::TempDebugGroup debuggroup("Image data upload");
-
-	gl.bindTextureToUnit(this, 0, false);
-
-	OpenGL::TextureFormat fmt = OpenGL::convertPixelFormat(pixelformat, false, sRGB);
-	GLenum gltarget = OpenGL::getGLTextureType(texType);
-
-	if (texType == TEXTURE_CUBE)
-		gltarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + slice;
-
-	if (isPixelFormatCompressed(pixelformat))
-	{
-		if (r.x != 0 || r.y != 0)
-			throw love::Exception("x and y parameters must be 0 for compressed images.");
-
-		if (texType == TEXTURE_2D || texType == TEXTURE_CUBE)
-			glCompressedTexImage2D(gltarget, level, fmt.internalformat, r.w, r.h, 0, size, data);
-		else if (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME)
-			glCompressedTexSubImage3D(gltarget, level, 0, 0, slice, r.w, r.h, 1, fmt.internalformat, size, data);
-	}
-	else
-	{
-		if (texType == TEXTURE_2D || texType == TEXTURE_CUBE)
-			glTexSubImage2D(gltarget, level, r.x, r.y, r.w, r.h, fmt.externalformat, fmt.type, data);
-		else if (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME)
-			glTexSubImage3D(gltarget, level, r.x, r.y, slice, r.w, r.h, 1, fmt.externalformat, fmt.type, data);
-	}
-}
-
-bool Image::loadVolatile()
-{
-	if (texture != 0)
-		return true;
-
-	OpenGL::TempDebugGroup debuggroup("Image load");
-
-	// NPOT textures don't support mipmapping without full NPOT support.
-	if ((GLAD_ES_VERSION_2_0 && !(GLAD_ES_VERSION_3_0 || GLAD_OES_texture_npot))
-		&& (pixelWidth != nextP2(pixelWidth) || pixelHeight != nextP2(pixelHeight)))
-	{
-		mipmapCount = 1;
-		samplerState.mipmapFilter = SamplerState::MIPMAP_FILTER_NONE;
-	}
-
-	glGenTextures(1, &texture);
-	gl.bindTextureToUnit(this, 0, false);
-
-	// Use a default texture if the size is too big for the system.
-	if (!validateDimensions(false))
-	{
-		loadDefaultTexture();
-		return true;
-	}
-
-	setSamplerState(samplerState);
-
-	while (glGetError() != GL_NO_ERROR); // Clear errors.
-
-	try
-	{
-		loadData();
-
-		GLenum glerr = glGetError();
-		if (glerr != GL_NO_ERROR)
-			throw love::Exception("Cannot create image (OpenGL error: %s)", OpenGL::errorString(glerr));
-	}
-	catch (love::Exception &)
-	{
-		gl.deleteTexture(texture);
-		texture = 0;
-		throw;
-	}
-
-	int64 memsize = 0;
-
-	for (int slice = 0; slice < slices.getSliceCount(0); slice++)
-		memsize += slices.get(slice, 0)->getSize();
-
-	if (getMipmapCount() > 1)
-		memsize *= 1.33334;
-
-	setGraphicsMemorySize(memsize);
-
-	usingDefaultTexture = false;
-	return true;
-}
-
-void Image::unloadVolatile()
-{
-	if (texture == 0)
-		return;
-
-	gl.deleteTexture(texture);
-	texture = 0;
-
-	setGraphicsMemorySize(0);
-}
-
-ptrdiff_t Image::getHandle() const
-{
-	return texture;
-}
-
-void Image::setSamplerState(const SamplerState &s)
-{
-	Texture::setSamplerState(s);
-
-	if (!OpenGL::hasTextureFilteringSupport(getPixelFormat()))
-	{
-		samplerState.magFilter = samplerState.minFilter = SamplerState::FILTER_NEAREST;
-
-		if (samplerState.mipmapFilter == SamplerState::MIPMAP_FILTER_LINEAR)
-			samplerState.mipmapFilter = SamplerState::MIPMAP_FILTER_NEAREST;
-	}
-
-	// We don't want filtering or (attempted) mipmaps on the default texture.
-	if (usingDefaultTexture)
-	{
-		samplerState.mipmapFilter = SamplerState::MIPMAP_FILTER_NONE;
-		samplerState.minFilter = samplerState.magFilter = SamplerState::FILTER_NEAREST;
-	}
-
-	// If we only have limited NPOT support then the wrap mode must be CLAMP.
-	if ((GLAD_ES_VERSION_2_0 && !(GLAD_ES_VERSION_3_0 || GLAD_OES_texture_npot))
-		&& (pixelWidth != nextP2(pixelWidth) || pixelHeight != nextP2(pixelHeight) || depth != nextP2(depth)))
-	{
-		samplerState.wrapU = samplerState.wrapV = samplerState.wrapW = SamplerState::WRAP_CLAMP;
-	}
-
-	gl.bindTextureToUnit(this, 0, false);
-	gl.setSamplerState(texType, samplerState);
-}
-
-} // opengl
-} // graphics
-} // love

src/modules/graphics/opengl/Image.h

@@ -1,72 +0,0 @@
-/**
- * Copyright (c) 2006-2020 LOVE Development Team
- *
- * This software is provided 'as-is', without any express or implied
- * warranty.  In no event will the authors be held liable for any damages
- * arising from the use of this software.
- *
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- *
- * 1. The origin of this software must not be misrepresented; you must not
- *    claim that you wrote the original software. If you use this software
- *    in a product, an acknowledgment in the product documentation would be
- *    appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- *    misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- **/
-
-#pragma once
-
-// LOVE
-#include "graphics/Texture.h"
-#include "graphics/Volatile.h"
-
-// OpenGL
-#include "OpenGL.h"
-
-namespace love
-{
-namespace graphics
-{
-namespace opengl
-{
-
-class Image final : public love::graphics::Texture, public Volatile
-{
-public:
-
-	Image(const Settings &settings, const Slices *data);
-
-	virtual ~Image();
-
-	// Implements Volatile.
-	bool loadVolatile() override;
-	void unloadVolatile() override;
-
-	ptrdiff_t getHandle() const override;
-	ptrdiff_t getRenderTargetHandle() const override { return 0; }
-
-	int getMSAA() const override { return 1; }
-	void setSamplerState(const SamplerState &s) override;
-	void generateMipmaps() override;
-
-private:
-
-	void uploadByteData(PixelFormat pixelformat, const void *data, size_t size, int level, int slice, const Rect &r, love::image::ImageDataBase *imgd = nullptr) override;
-
-	void loadDefaultTexture();
-	void loadData();
-
-	Slices slices;
-
-	// OpenGL texture identifier.
-	GLuint texture;
-
-}; // Image
-
-} // opengl
-} // graphics
-} // love

src/modules/graphics/opengl/OpenGL.cpp

@@ -23,7 +23,6 @@
 #include "OpenGL.h"
 
 #include "Shader.h"
-#include "Canvas.h"
 #include "common/Exception.h"
 
 #include "graphics/Graphics.h"

src/modules/graphics/opengl/Shader.cpp

@@ -195,7 +195,7 @@ void Shader::mapActiveUniforms()
 
 					glUniform1iv(u.location, u.count, u.ints);
 
-					u.textures = new Texture*[u.count];
+					u.textures = new love::graphics::Texture*[u.count];
 					memset(u.textures, 0, sizeof(Texture *) * u.count);
 				}
 			}
@@ -564,12 +564,12 @@ void Shader::updateUniform(const UniformInfo *info, int count, bool internalupda
 	}
 }
 
-void Shader::sendTextures(const UniformInfo *info, Texture **textures, int count)
+void Shader::sendTextures(const UniformInfo *info, love::graphics::Texture **textures, int count)
 {
 	Shader::sendTextures(info, textures, count, false);
 }
 
-void Shader::sendTextures(const UniformInfo *info, Texture **textures, int count, bool internalUpdate)
+void Shader::sendTextures(const UniformInfo *info, love::graphics::Texture **textures, int count, bool internalUpdate)
 {
 	if (info->baseType != UNIFORM_SAMPLER)
 		return;
@@ -584,7 +584,7 @@ void Shader::sendTextures(const UniformInfo *info, Texture **textures, int count
 	// Bind the textures to the texture units.
 	for (int i = 0; i < count; i++)
 	{
-		Texture *tex = textures[i];
+		love::graphics::Texture *tex = textures[i];
 
 		if (tex != nullptr)
 		{
@@ -671,7 +671,7 @@ int Shader::getVertexAttributeIndex(const std::string &name)
 	return location;
 }
 
-void Shader::setVideoTextures(Texture *ytexture, Texture *cbtexture, Texture *crtexture)
+void Shader::setVideoTextures(love::graphics::Texture *ytexture, love::graphics::Texture *cbtexture, love::graphics::Texture *crtexture)
 {
 	const BuiltinUniform builtins[3] = {
 		BUILTIN_TEXTURE_VIDEO_Y,
@@ -679,7 +679,7 @@ void Shader::setVideoTextures(Texture *ytexture, Texture *cbtexture, Texture *cr
 		BUILTIN_TEXTURE_VIDEO_CR,
 	};
 
-	Texture *textures[3] = {ytexture, cbtexture, crtexture};
+	love::graphics::Texture *textures[3] = {ytexture, cbtexture, crtexture};
 
 	for (int i = 0; i < 3; i++)
 	{

src/modules/graphics/opengl/Shader.h

@@ -61,10 +61,10 @@ public:
 	const UniformInfo *getUniformInfo(const std::string &name) const override;
 	const UniformInfo *getUniformInfo(BuiltinUniform builtin) const override;
 	void updateUniform(const UniformInfo *info, int count) override;
-	void sendTextures(const UniformInfo *info, Texture **textures, int count) override;
+	void sendTextures(const UniformInfo *info, love::graphics::Texture **textures, int count) override;
 	bool hasUniform(const std::string &name) const override;
 	ptrdiff_t getHandle() const override;
-	void setVideoTextures(Texture *ytexture, Texture *cbtexture, Texture *crtexture) override;
+	void setVideoTextures(love::graphics::Texture *ytexture, love::graphics::Texture *cbtexture, love::graphics::Texture *crtexture) override;
 
 	void updatePointSize(float size);
 	void updateBuiltinUniforms(love::graphics::Graphics *gfx, int viewportW, int viewportH);
@@ -82,7 +82,7 @@ private:
 	void mapActiveUniforms();
 
 	void updateUniform(const UniformInfo *info, int count, bool internalupdate);
-	void sendTextures(const UniformInfo *info, Texture **textures, int count, bool internalupdate);
+	void sendTextures(const UniformInfo *info, love::graphics::Texture **textures, int count, bool internalupdate);
 
 	int getUniformTypeComponents(GLenum type) const;
 	MatrixSize getMatrixSize(GLenum type) const;

src/modules/graphics/opengl/Texture.cpp

@@ -18,11 +18,14 @@
  * 3. This notice may not be removed or altered from any source distribution.
  **/
 
-#include "Canvas.h"
+#include "Texture.h"
+
 #include "graphics/Graphics.h"
 #include "Graphics.h"
+#include "common/int.h"
 
-#include <algorithm> // For min/max
+// STD
+#include <algorithm> // for min/max
 
 namespace love
 {
@@ -31,7 +34,7 @@ namespace graphics
 namespace opengl
 {
 
-static GLenum createFBO(GLuint &framebuffer, TextureType texType, PixelFormat format, GLuint texture, int layers)
+static GLenum createFBO(GLuint &framebuffer, TextureType texType, PixelFormat format, GLuint texture, int layers, bool clear)
 {
 	// get currently bound fbo to reset to it later
 	GLuint current_fbo = gl.getFramebuffer(OpenGL::FRAMEBUFFER_ALL);
@@ -100,7 +103,7 @@ static GLenum createFBO(GLuint &framebuffer, TextureType texType, PixelFormat fo
 	return status;
 }
 
-static bool createRenderbuffer(int width, int height, int &samples, PixelFormat pixelformat, GLuint &buffer)
+static bool newRenderbuffer(int width, int height, int &samples, PixelFormat pixelformat, GLuint &buffer)
 {
 	int reqsamples = samples;
 	bool unusedSRGB = false;
@@ -140,8 +143,6 @@ static bool createRenderbuffer(int width, int height, int &samples, PixelFormat
 
 	if (samples > 1)
 		glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
-	else
-		samples = 0;
 
 	glBindRenderbuffer(GL_RENDERBUFFER, 0);
 
@@ -173,7 +174,7 @@ static bool createRenderbuffer(int width, int height, int &samples, PixelFormat
 	{
 		glDeleteRenderbuffers(1, &buffer);
 		buffer = 0;
-		samples = 0;
+		samples = 1;
 	}
 
 	gl.bindFramebuffer(OpenGL::FRAMEBUFFER_ALL, current_fbo);
@@ -182,110 +183,221 @@ static bool createRenderbuffer(int width, int height, int &samples, PixelFormat
 	return status == GL_FRAMEBUFFER_COMPLETE;
 }
 
-Canvas::Canvas(const Settings &settings)
-	: love::graphics::Texture(settings, nullptr)
+Texture::Texture(const Settings &settings, const Slices *data)
+	: love::graphics::Texture(settings, data)
+	, slices(settings.type)
 	, fbo(0)
 	, texture(0)
-    , renderbuffer(0)
-	, actualSamples(0)
+	, renderbuffer(0)
+	, framebufferStatus(GL_FRAMEBUFFER_COMPLETE)
+	, actualSamples(1)
 {
-	auto gfx = Module::getInstance<Graphics>(Module::M_GRAPHICS);
-	if (gfx != nullptr)
-		format = gfx->getSizedFormat(format, renderTarget, readable, sRGB);
-
+	if (data != nullptr)
+		slices = *data;
 	loadVolatile();
-
-	if (status != GL_FRAMEBUFFER_COMPLETE)
-		throw love::Exception("Cannot create Canvas: %s", OpenGL::framebufferStatusString(status));
 }
 
-Canvas::~Canvas()
+Texture::~Texture()
 {
 	unloadVolatile();
 }
 
-bool Canvas::loadVolatile()
+bool Texture::createTexture()
 {
-	if (texture != 0)
-		return true;
+	// The base class handles some validation. For example, if ImageData is
+	// given then it must exist for all mip levels, a render target can't use
+	// a compressed format, etc.
 
-	OpenGL::TempDebugGroup debuggroup("Canvas load");
+	glGenTextures(1, &texture);
+	gl.bindTextureToUnit(this, 0, false);
 
-	fbo = texture = 0;
-	renderbuffer = 0;
-	status = GL_FRAMEBUFFER_COMPLETE;
-
-	// getMaxRenderbufferSamples will be 0 on systems that don't support
-	// multisampled renderbuffers / don't export FBO multisample extensions.
-	actualSamples = std::min(getRequestedMSAA(), gl.getMaxRenderbufferSamples());
-	actualSamples = std::max(actualSamples, 0);
-	actualSamples = actualSamples == 1 ? 0 : actualSamples;
-
-	if (isReadable())
+	// Use a default texture if the size is too big for the system.
+	// validateDimensions is also called in the base class for RTs and
+	// non-readable textures.
+	if (!renderTarget && !validateDimensions(false))
 	{
-		glGenTextures(1, &texture);
-		gl.bindTextureToUnit(this, 0, false);
-
-		GLenum gltype = OpenGL::getGLTextureType(texType);
-
-		if (GLAD_ANGLE_texture_usage)
-			glTexParameteri(gltype, GL_TEXTURE_USAGE_ANGLE, GL_FRAMEBUFFER_ATTACHMENT_ANGLE);
+		usingDefaultTexture = true;
 
 		setSamplerState(samplerState);
 
-		while (glGetError() != GL_NO_ERROR)
-			/* Clear the error buffer. */;
+		bool isSRGB = false;
+		gl.rawTexStorage(texType, 1, PIXELFORMAT_RGBA8_UNORM, isSRGB, 2, 2, 1);
 
-		bool isSRGB = format == PIXELFORMAT_sRGBA8_UNORM;
-		if (!gl.rawTexStorage(texType, mipmapCount, format, isSRGB, pixelWidth, pixelHeight, texType == TEXTURE_VOLUME ? depth : layers))
-		{
-			status = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
-			return false;
-		}
+		// A nice friendly checkerboard to signify invalid textures...
+		GLubyte px[] = {0xFF,0xFF,0xFF,0xFF, 0xFF,0xA0,0xA0,0xFF,
+						0xFF,0xA0,0xA0,0xFF, 0xFF,0xFF,0xFF,0xFF};
 
-		if (glGetError() != GL_NO_ERROR)
-		{
-			gl.deleteTexture(texture);
-			texture = 0;
-			status = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
-			return false;
-		}
+		int slices = texType == TEXTURE_CUBE ? 6 : 1;
+		Rect rect = {0, 0, 2, 2};
+		for (int slice = 0; slice < slices; slice++)
+			uploadByteData(PIXELFORMAT_RGBA8_UNORM, px, sizeof(px), 0, slice, rect, nullptr);
 
-		// Create a local FBO used for glReadPixels as well as MSAA blitting.
-		status = createFBO(fbo, texType, format, texture, texType == TEXTURE_VOLUME ? depth : layers);
-
-		if (status != GL_FRAMEBUFFER_COMPLETE)
-		{
-			if (fbo != 0)
-			{
-				gl.deleteFramebuffer(fbo);
-				fbo = 0;
-			}
-			return false;
-		}
+		return true;
 	}
 
-	if (!isReadable() || actualSamples > 0)
-		createRenderbuffer(pixelWidth, pixelHeight, actualSamples, format, renderbuffer);
+	GLenum gltype = OpenGL::getGLTextureType(texType);
+	if (renderTarget && GLAD_ANGLE_texture_usage)
+		glTexParameteri(gltype, GL_TEXTURE_USAGE_ANGLE, GL_FRAMEBUFFER_ATTACHMENT_ANGLE);
 
-	int64 memsize = getPixelFormatSize(format) * pixelWidth * pixelHeight;
-	if (getMipmapCount() > 1)
-		memsize *= 1.33334;
+	setSamplerState(samplerState);
 
-	if (actualSamples > 1 && isReadable())
-		memsize += getPixelFormatSize(format) * pixelWidth * pixelHeight * actualSamples;
-	else if (actualSamples > 1)
-		memsize *= actualSamples;
+	int mipcount = getMipmapCount();
+	int slicecount = 1;
 
-	setGraphicsMemorySize(memsize);
+	if (texType == TEXTURE_VOLUME)
+		slicecount = getDepth();
+	else if (texType == TEXTURE_2D_ARRAY)
+		slicecount = getLayerCount();
+	else if (texType == TEXTURE_CUBE)
+		slicecount = 6;
 
-	if (getMipmapCount() > 1)
+	if (!isCompressed())
+		gl.rawTexStorage(texType, mipcount, format, sRGB, pixelWidth, pixelHeight, texType == TEXTURE_VOLUME ? depth : layers);
+
+	int w = pixelWidth;
+	int h = pixelHeight;
+	int d = depth;
+
+	OpenGL::TextureFormat fmt = gl.convertPixelFormat(format, false, sRGB);
+
+	for (int mip = 0; mip < mipcount; mip++)
+	{
+		if (isCompressed() && (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME))
+		{
+			size_t mipsize = 0;
+
+			if (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME)
+			{
+				for (int slice = 0; slice < slices.getSliceCount(mip); slice++)
+				{
+					auto id = slices.get(slice, mip);
+					if (id != nullptr)
+						mipsize += id->getSize();
+				}
+			}
+
+			if (mipsize > 0)
+			{
+				GLenum gltarget = OpenGL::getGLTextureType(texType);
+				glCompressedTexImage3D(gltarget, mip, fmt.internalformat, w, h, d, 0, mipsize, nullptr);
+			}
+		}
+
+		for (int slice = 0; slice < slicecount; slice++)
+		{
+			love::image::ImageDataBase *id = slices.get(slice, mip);
+			if (id != nullptr)
+				uploadImageData(id, mip, slice, 0, 0);
+		}
+
+		w = std::max(w / 2, 1);
+		h = std::max(h / 2, 1);
+
+		if (texType == TEXTURE_VOLUME)
+			d = std::max(d / 2, 1);
+	}
+
+	bool hasdata = slices.get(0, 0) != nullptr;
+
+	// Create a local FBO used for glReadPixels as well as MSAA blitting.
+	if (isRenderTarget())
+	{
+		bool clear = !hasdata;
+		int slices = texType == TEXTURE_VOLUME ? depth : layers;
+		framebufferStatus = createFBO(fbo, texType, format, texture, slices, clear);
+	}
+	else if (!hasdata)
+	{
+		// Initialize all slices to transparent black.
+		std::vector<uint8> emptydata(getPixelFormatSliceSize(format, w, h));
+
+		Rect r = {0, 0, w, h};
+		int slices = texType == TEXTURE_VOLUME ? depth : layers;
+		slices = texType == TEXTURE_CUBE ? 6 : slices;
+		for (int i = 0; i < slices; i++)
+			uploadByteData(format, emptydata.data(), emptydata.size(), 0, i, r);
+	}
+
+	// Non-readable textures can't have mipmaps (enforced in the base class),
+	// so generateMipmaps here is fine - when they aren't already initialized.
+	if (getMipmapCount() > 1 && slices.getMipmapCount() <= 1)
 		generateMipmaps();
 
 	return true;
 }
 
-void Canvas::unloadVolatile()
+bool Texture::createRenderbuffer()
+{
+	if (isReadable() && actualSamples <= 1)
+		return true;
+
+	return newRenderbuffer(pixelWidth, pixelHeight, actualSamples, format, renderbuffer);
+}
+
+bool Texture::loadVolatile()
+{
+	if (texture != 0 || renderbuffer != 0)
+		return true;
+
+	OpenGL::TempDebugGroup debuggroup("Texture load");
+
+	// NPOT textures don't support mipmapping without full NPOT support.
+	if ((GLAD_ES_VERSION_2_0 && !(GLAD_ES_VERSION_3_0 || GLAD_OES_texture_npot))
+		&& (pixelWidth != nextP2(pixelWidth) || pixelHeight != nextP2(pixelHeight)))
+	{
+		mipmapCount = 1;
+		samplerState.mipmapFilter = SamplerState::MIPMAP_FILTER_NONE;
+	}
+
+	// getMaxRenderbufferSamples will be 0 on systems that don't support
+	// multisampled renderbuffers / don't export FBO multisample extensions.
+	actualSamples = std::min(getRequestedMSAA(), gl.getMaxRenderbufferSamples());
+	actualSamples = std::max(actualSamples, 1);
+
+	while (glGetError() != GL_NO_ERROR); // Clear errors.
+
+	try
+	{
+		if (isReadable())
+			createTexture();
+		if (!isReadable() && actualSamples > 1)
+			createRenderbuffer();
+
+		GLenum glerr = glGetError();
+		if (glerr != GL_NO_ERROR)
+			throw love::Exception("Cannot create texture (OpenGL error: %s)", OpenGL::errorString(glerr));
+	}
+	catch (love::Exception &)
+	{
+		unloadVolatile();
+		throw;
+	}
+
+	int64 memsize = 0;
+
+	for (int mip = 0; mip < getMipmapCount(); mip++)
+	{
+		int w = getPixelWidth(mip);
+		int h = getPixelHeight(mip);
+		int slices = getDepth(mip) * layers * (texType == TEXTURE_CUBE ? 6 : 1);
+		memsize += getPixelFormatSliceSize(format, w, h) * slices;
+	}
+
+	if (actualSamples > 1 && isReadable())
+	{
+		int slices = depth * layers * (texType == TEXTURE_CUBE ? 6 : 1);
+		memsize += getPixelFormatSliceSize(format, pixelWidth, pixelHeight) * slices * actualSamples;
+	}
+	else if (actualSamples > 1)
+		memsize *= actualSamples;
+
+	setGraphicsMemorySize(memsize);
+
+	usingDefaultTexture = false;
+	return true;
+}
+
+void Texture::unloadVolatile()
 {
 	if (isRenderTarget() && (fbo != 0 || renderbuffer != 0 || texture != 0))
 	{
@@ -312,41 +424,73 @@ void Canvas::unloadVolatile()
 	setGraphicsMemorySize(0);
 }
 
-void Canvas::setSamplerState(const SamplerState &s)
+void Texture::uploadByteData(PixelFormat pixelformat, const void *data, size_t size, int level, int slice, const Rect &r, love::image::ImageDataBase *imgd)
 {
-	Texture::setSamplerState(s);
+	love::image::ImageDataBase *oldd = slices.get(slice, level);
 
-	if (samplerState.depthSampleMode.hasValue && !gl.isDepthCompareSampleSupported())
-		throw love::Exception("Depth comparison sampling in shaders is not supported on this system.");
-
-	if (!OpenGL::hasTextureFilteringSupport(getPixelFormat()))
+	// We can only replace the internal Data (used when reloading due to setMode)
+	// if the dimensions match.
+	if (imgd != nullptr && oldd != nullptr && oldd->getWidth() == imgd->getWidth()
+		&& oldd->getHeight() == imgd->getHeight())
 	{
-		samplerState.magFilter = samplerState.minFilter = SamplerState::FILTER_NEAREST;
-
-		if (samplerState.mipmapFilter == SamplerState::MIPMAP_FILTER_LINEAR)
-			samplerState.mipmapFilter = SamplerState::MIPMAP_FILTER_NEAREST;
+		slices.set(slice, level, imgd);
 	}
 
-	// If we only have limited NPOT support then the wrap mode must be CLAMP.
-	if ((GLAD_ES_VERSION_2_0 && !(GLAD_ES_VERSION_3_0 || GLAD_OES_texture_npot))
-		&& (pixelWidth != nextP2(pixelWidth) || pixelHeight != nextP2(pixelHeight) || depth != nextP2(depth)))
-	{
-		samplerState.wrapU = samplerState.wrapV = samplerState.wrapW = SamplerState::WRAP_CLAMP;
-	}
+	OpenGL::TempDebugGroup debuggroup("Texture data upload");
 
 	gl.bindTextureToUnit(this, 0, false);
-	gl.setSamplerState(texType, samplerState);
+
+	OpenGL::TextureFormat fmt = OpenGL::convertPixelFormat(pixelformat, false, sRGB);
+	GLenum gltarget = OpenGL::getGLTextureType(texType);
+
+	if (texType == TEXTURE_CUBE)
+		gltarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + slice;
+
+	if (isPixelFormatCompressed(pixelformat))
+	{
+		if (r.x != 0 || r.y != 0)
+			throw love::Exception("x and y parameters must be 0 for compressed textures.");
+
+		if (texType == TEXTURE_2D || texType == TEXTURE_CUBE)
+			glCompressedTexImage2D(gltarget, level, fmt.internalformat, r.w, r.h, 0, size, data);
+		else if (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME)
+			glCompressedTexSubImage3D(gltarget, level, 0, 0, slice, r.w, r.h, 1, fmt.internalformat, size, data);
+	}
+	else
+	{
+		if (texType == TEXTURE_2D || texType == TEXTURE_CUBE)
+			glTexSubImage2D(gltarget, level, r.x, r.y, r.w, r.h, fmt.externalformat, fmt.type, data);
+		else if (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME)
+			glTexSubImage3D(gltarget, level, r.x, r.y, slice, r.w, r.h, 1, fmt.externalformat, fmt.type, data);
+	}
 }
 
-ptrdiff_t Canvas::getHandle() const
+void Texture::generateMipmaps()
 {
-	return texture;
+	if (getMipmapCount() == 1 || getMipmapsMode() == MIPMAPS_NONE)
+		throw love::Exception("generateMipmaps can only be called on a Texture which was created with mipmaps enabled.");
+
+	if (isPixelFormatCompressed(format))
+		throw love::Exception("generateMipmaps cannot be called on a compressed Texture.");
+
+	gl.bindTextureToUnit(this, 0, false);
+
+	GLenum gltextype = OpenGL::getGLTextureType(texType);
+
+	if (gl.bugs.generateMipmapsRequiresTexture2DEnable)
+		glEnable(gltextype);
+
+	glGenerateMipmap(gltextype);
 }
 
-love::image::ImageData *Canvas::newImageData(love::image::Image *module, int slice, int mipmap, const Rect &r)
+love::image::ImageData *Texture::newImageData(love::image::Image *module, int slice, int mipmap, const Rect &r)
 {
+	// Base class does validation (only RTs allowed, etc) and creates ImageData.
 	love::image::ImageData *data = love::graphics::Texture::newImageData(module, slice, mipmap, r);
 
+	if (fbo == 0) // Should never be reached.
+		return data;
+
 	bool isSRGB = false;
 	OpenGL::TextureFormat fmt = gl.convertPixelFormat(data->getFormat(), false, isSRGB);
 
@@ -370,53 +514,48 @@ love::image::ImageData *Canvas::newImageData(love::image::Image *module, int sli
 	return data;
 }
 
-void Canvas::generateMipmaps()
+void Texture::setSamplerState(const SamplerState &s)
 {
-	if (getMipmapCount() == 1 || getMipmapsMode() == MIPMAPS_NONE)
-		throw love::Exception("generateMipmaps can only be called on a Texture which was created with mipmaps enabled.");
+	if (samplerState.depthSampleMode.hasValue && !gl.isDepthCompareSampleSupported())
+		throw love::Exception("Depth comparison sampling in shaders is not supported on this system.");
 
-	if (isPixelFormatCompressed(format))
-		throw love::Exception("generateMipmaps cannot be called on a compressed Texture.");
+	// Base class does common validation and assigns samplerState.
+	love::graphics::Texture::setSamplerState(s);
+
+	if (!OpenGL::hasTextureFilteringSupport(getPixelFormat()))
+	{
+		samplerState.magFilter = samplerState.minFilter = SamplerState::FILTER_NEAREST;
+
+		if (samplerState.mipmapFilter == SamplerState::MIPMAP_FILTER_LINEAR)
+			samplerState.mipmapFilter = SamplerState::MIPMAP_FILTER_NEAREST;
+	}
+
+	// We don't want filtering or (attempted) mipmaps on the default texture.
+	if (usingDefaultTexture)
+	{
+		samplerState.mipmapFilter = SamplerState::MIPMAP_FILTER_NONE;
+		samplerState.minFilter = samplerState.magFilter = SamplerState::FILTER_NEAREST;
+	}
+
+	// If we only have limited NPOT support then the wrap mode must be CLAMP.
+	if ((GLAD_ES_VERSION_2_0 && !(GLAD_ES_VERSION_3_0 || GLAD_OES_texture_npot))
+		&& (pixelWidth != nextP2(pixelWidth) || pixelHeight != nextP2(pixelHeight) || depth != nextP2(depth)))
+	{
+		samplerState.wrapU = samplerState.wrapV = samplerState.wrapW = SamplerState::WRAP_CLAMP;
+	}
 
 	gl.bindTextureToUnit(this, 0, false);
-
-	GLenum gltextype = OpenGL::getGLTextureType(texType);
-
-	if (gl.bugs.generateMipmapsRequiresTexture2DEnable)
-		glEnable(gltextype);
-
-	glGenerateMipmap(gltextype);
+	gl.setSamplerState(texType, samplerState);
 }
 
-void Canvas::uploadByteData(PixelFormat pixelformat, const void *data, size_t size, int level, int slice, const Rect &r, love::image::ImageDataBase */*imgd*/)
+ptrdiff_t Texture::getHandle() const
 {
-	OpenGL::TempDebugGroup debuggroup("Texture data upload");
+	return texture;
+}
 
-	gl.bindTextureToUnit(this, 0, false);
-
-	OpenGL::TextureFormat fmt = OpenGL::convertPixelFormat(pixelformat, false, sRGB);
-	GLenum gltarget = OpenGL::getGLTextureType(texType);
-
-	if (texType == TEXTURE_CUBE)
-		gltarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + slice;
-
-	if (isPixelFormatCompressed(pixelformat))
-	{
-		if (r.x != 0 || r.y != 0)
-			throw love::Exception("x and y parameters must be 0 for compressed images.");
-
-		if (texType == TEXTURE_2D || texType == TEXTURE_CUBE)
-			glCompressedTexImage2D(gltarget, level, fmt.internalformat, r.w, r.h, 0, size, data);
-		else if (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME)
-			glCompressedTexSubImage3D(gltarget, level, 0, 0, slice, r.w, r.h, 1, fmt.internalformat, size, data);
-	}
-	else
-	{
-		if (texType == TEXTURE_2D || texType == TEXTURE_CUBE)
-			glTexSubImage2D(gltarget, level, r.x, r.y, r.w, r.h, fmt.externalformat, fmt.type, data);
-		else if (texType == TEXTURE_2D_ARRAY || texType == TEXTURE_VOLUME)
-			glTexSubImage3D(gltarget, level, r.x, r.y, slice, r.w, r.h, 1, fmt.externalformat, fmt.type, data);
-	}
+ptrdiff_t Texture::getRenderTargetHandle() const
+{
+	return renderTarget ? (renderbuffer != 0 ? renderbuffer : texture) : 0;
 }
 
 } // opengl

src/modules/graphics/opengl/Texture.h

@@ -18,14 +18,13 @@
  * 3. This notice may not be removed or altered from any source distribution.
  **/
 
-#ifndef LOVE_GRAPHICS_OPENGL_CANVAS_H
-#define LOVE_GRAPHICS_OPENGL_CANVAS_H
+#pragma once
 
-#include "common/config.h"
-#include "common/Color.h"
-#include "common/int.h"
+// LOVE
 #include "graphics/Texture.h"
 #include "graphics/Volatile.h"
+
+// OpenGL
 #include "OpenGL.h"
 
 namespace love
@@ -35,56 +34,48 @@ namespace graphics
 namespace opengl
 {
 
-class Canvas final : public love::graphics::Texture, public Volatile
+class Texture final : public love::graphics::Texture, public Volatile
 {
 public:
 
-	Canvas(const Settings &settings);
-	virtual ~Canvas();
+	Texture(const Settings &settings, const Slices *data);
+
+	virtual ~Texture();
 
 	// Implements Volatile.
 	bool loadVolatile() override;
 	void unloadVolatile() override;
 
-	// Implements Texture.
-	void setSamplerState(const SamplerState &s) override;
-	ptrdiff_t getHandle() const override;
-
-	love::image::ImageData *newImageData(love::image::Image *module, int slice, int mipmap, const Rect &rect) override;
 	void generateMipmaps() override;
+	love::image::ImageData *newImageData(love::image::Image *module, int slice, int mipmap, const Rect &rect) override;
+	void setSamplerState(const SamplerState &s) override;
 
-	int getMSAA() const override
-	{
-		return actualSamples;
-	}
+	ptrdiff_t getHandle() const override;
+	ptrdiff_t getRenderTargetHandle() const override;
+	int getMSAA() const override { return actualSamples; }
 
-	ptrdiff_t getRenderTargetHandle() const override
-	{
-		return renderbuffer != 0 ? renderbuffer : texture;
-	}
-
-	inline GLuint getFBO() const
-	{
-		return fbo;
-	}
+	inline GLuint getFBO() const { return fbo; }
 
 private:
 
+	bool createTexture();
+	bool createRenderbuffer();
+
 	void uploadByteData(PixelFormat pixelformat, const void *data, size_t size, int level, int slice, const Rect &r, love::image::ImageDataBase *imgd = nullptr) override;
 
+	Slices slices;
+
 	GLuint fbo;
 
 	GLuint texture;
 	GLuint renderbuffer;
 
-	GLenum status;
+	GLenum framebufferStatus;
 
 	int actualSamples;
 
-}; // Canvas
+}; // Texture
 
 } // opengl
 } // graphics
 } // love
-
-#endif // LOVE_GRAPHICS_OPENGL_CANVAS_H

src/modules/image/ImageData.cpp

@@ -84,7 +84,7 @@ love::image::ImageData *ImageData::clone() const
 
 void ImageData::create(int width, int height, PixelFormat format, void *data)
 {
-	size_t datasize = width * height * getPixelFormatSize(format);
+	size_t datasize = getPixelFormatSliceSize(format, width, height);
 
 	try
 	{
@@ -140,7 +140,7 @@ void ImageData::decode(Data *data)
 			throw love::Exception("Could not decode data to ImageData: unsupported encoded format");
 	}
 
-	if (decodedimage.size != decodedimage.width * decodedimage.height * getPixelFormatSize(decodedimage.format))
+	if (decodedimage.size != getPixelFormatSliceSize(decodedimage.format, decodedimage.width, decodedimage.height))
 	{
 		decoder->freeRawPixels(decodedimage.data);
 		throw love::Exception("Could not convert image!");
@@ -782,7 +782,7 @@ love::thread::Mutex *ImageData::getMutex() const
 
 size_t ImageData::getPixelSize() const
 {
-	return getPixelFormatSize(format);
+	return getPixelFormatBlockSize(format);
 }
 
 bool ImageData::validPixelFormat(PixelFormat format)

src/modules/image/magpie/EXRHandler.cpp

@@ -193,7 +193,7 @@ FormatHandler::DecodedImage EXRHandler::decode(Data *data)
 		throw love::Exception("Could not decode EXR image: unknown pixel format.");
 	}
 
-	img.size = img.width * img.height * getPixelFormatSize(img.format);
+	img.size = getPixelFormatSliceSize(img.format, img.width, img.height);
 
 	FreeEXRImage(&exrImage);
 

src/modules/window/sdl/Window.cpp

@@ -933,7 +933,7 @@ bool Window::setIcon(love::image::ImageData *imgd)
 
 	int w = imgd->getWidth();
 	int h = imgd->getHeight();
-	int bytesperpixel = (int) getPixelFormatSize(imgd->getFormat());
+	int bytesperpixel = (int) getPixelFormatBlockSize(imgd->getFormat());
 	int pitch = w * bytesperpixel;
 
 	SDL_Surface *sdlicon = nullptr;