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Stencil buffers are now created and attached to canvases on-demand, instead of always on canvas creation.

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saves VRAM when stencils aren't used in canvases.
This commit is contained in:
Alex Szpakowski
2013-05-22 23:08:21 -03:00
parent ac094f9437
commit 0e9d73503c
3 changed files with 110 additions and 87 deletions
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src/modules/graphics/opengl/Canvas.cpp
+100 -86
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@@ -40,20 +40,32 @@ struct FramebufferStrategy
{
virtual ~FramebufferStrategy() {}
/// create a new framebuffer, depth_stencil and texture
/// create a new framebuffer and texture
/**
* @param[out] framebuffer Framebuffer name
* @param[out] depth_stencil Name for packed depth and stencil buffer
* @param[out] img Texture name
* @param[in] width Width of framebuffer
* @param[in] height Height of framebuffer
* @param[in] texture_type Type of the canvas texture.
* @return Creation status
*/
virtual GLenum createFBO(GLuint &, GLuint &, GLuint &, int, int, Canvas::TextureType)
virtual GLenum createFBO(GLuint &, GLuint &, int, int, Canvas::TextureType)
{
return GL_FRAMEBUFFER_UNSUPPORTED;
}
/// Create a stencil buffer and attach it to the active framebuffer object
/**
* @param[in] width Width of the stencil buffer
* @param[in] height Height of the stencil buffer
* @param[out] stencil Name for stencil buffer
* @return Whether the stencil buffer was successfully created
**/
virtual bool createStencil(int, int, GLuint &)
{
return false;
}
/// remove objects
/**
* @param[in] framebuffer Framebuffer name
@@ -75,7 +87,7 @@ struct FramebufferStrategy
struct FramebufferStrategyGL3 : public FramebufferStrategy
{
virtual GLenum createFBO(GLuint &framebuffer, GLuint &depth_stencil, GLuint &img, int width, int height, Canvas::TextureType texture_type)
virtual GLenum createFBO(GLuint &framebuffer, GLuint &img, int width, int height, Canvas::TextureType texture_type)
{
// get currently bound fbo to reset to it later
GLint current_fbo;
@@ -85,28 +97,19 @@ struct FramebufferStrategyGL3 : public FramebufferStrategy
glGenFramebuffers(1, &framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
// create stencil buffer
glGenRenderbuffers(1, &depth_stencil);
glBindRenderbuffer(GL_RENDERBUFFER, depth_stencil);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_STENCIL, width, height);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, depth_stencil);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, depth_stencil);
// generate texture save target
GLint internalFormat;
GLenum format;
switch (texture_type)
{
case Canvas::TYPE_HDR:
internalFormat = GL_RGBA16F;
format = GL_FLOAT;
break;
case Canvas::TYPE_NORMAL:
default:
internalFormat = GL_RGBA8;
format = GL_UNSIGNED_BYTE;
case Canvas::TYPE_HDR:
internalFormat = GL_RGBA16F;
format = GL_FLOAT;
break;
case Canvas::TYPE_NORMAL:
default:
internalFormat = GL_RGBA8;
format = GL_UNSIGNED_BYTE;
}
glGenTextures(1, &img);
@@ -124,10 +127,29 @@ struct FramebufferStrategyGL3 : public FramebufferStrategy
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
// unbind framebuffer
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, (GLuint) current_fbo);
return status;
}
virtual bool createStencil(int width, int height, GLuint &stencil)
{
// create combined depth/stencil buffer
glDeleteRenderbuffers(1, &stencil);
glGenRenderbuffers(1, &stencil);
glBindRenderbuffer(GL_RENDERBUFFER, stencil);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_STENCIL, width, height);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, stencil);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, stencil);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
// check status
return glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE;
}
virtual void deleteFBO(GLuint framebuffer, GLuint depth_stencil, GLuint img)
{
gl.deleteTexture(img);
@@ -177,7 +199,7 @@ struct FramebufferStrategyGL3 : public FramebufferStrategy
struct FramebufferStrategyPackedEXT : public FramebufferStrategy
{
virtual GLenum createFBO(GLuint &framebuffer, GLuint &depth_stencil, GLuint &img, int width, int height, Canvas::TextureType texture_type)
virtual GLenum createFBO(GLuint &framebuffer, GLuint &img, int width, int height, Canvas::TextureType texture_type)
{
GLint current_fbo;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING_EXT, &current_fbo);
@@ -186,29 +208,19 @@ struct FramebufferStrategyPackedEXT : public FramebufferStrategy
glGenFramebuffersEXT(1, &framebuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer);
// create stencil buffer
glGenRenderbuffersEXT(1, &depth_stencil);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depth_stencil);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_STENCIL_EXT,
width, height);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_stencil);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depth_stencil);
// generate texture save target
GLint internalFormat;
GLenum format;
switch (texture_type)
{
case Canvas::TYPE_HDR:
internalFormat = GL_RGBA16F;
format = GL_FLOAT;
break;
case Canvas::TYPE_NORMAL:
default:
internalFormat = GL_RGBA8;
format = GL_UNSIGNED_BYTE;
case Canvas::TYPE_HDR:
internalFormat = GL_RGBA16F;
format = GL_FLOAT;
break;
case Canvas::TYPE_NORMAL:
default:
internalFormat = GL_RGBA8;
format = GL_UNSIGNED_BYTE;
}
glGenTextures(1, &img);
@@ -226,11 +238,29 @@ struct FramebufferStrategyPackedEXT : public FramebufferStrategy
GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
// unbind framebuffer
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, (GLuint) current_fbo);
return status;
}
virtual bool createStencil(int width, int height, GLuint &stencil)
{
// create combined depth/stencil buffer
glDeleteRenderbuffers(1, &stencil);
glGenRenderbuffersEXT(1, &stencil);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, stencil);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_STENCIL_EXT,
width, height);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, stencil);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, stencil);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
// check status
return glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) == GL_FRAMEBUFFER_COMPLETE_EXT;
}
virtual void deleteFBO(GLuint framebuffer, GLuint depth_stencil, GLuint img)
{
gl.deleteTexture(img);
@@ -280,62 +310,27 @@ struct FramebufferStrategyPackedEXT : public FramebufferStrategy
struct FramebufferStrategyEXT : public FramebufferStrategyPackedEXT
{
virtual GLenum createFBO(GLuint &framebuffer, GLuint &stencil, GLuint &img, int width, int height, Canvas::TextureType texture_type)
virtual bool createStencil(int width, int height, GLuint &stencil)
{
GLint current_fbo;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING_EXT, &current_fbo);
// create framebuffer
glGenFramebuffersEXT(1, &framebuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer);
// create stencil buffer
glDeleteRenderbuffers(1, &stencil);
glGenRenderbuffersEXT(1, &stencil);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, stencil);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX,
width, height);
width, height);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, stencil);
GL_RENDERBUFFER_EXT, stencil);
// generate texture save target
GLint internalFormat;
GLenum format;
switch (texture_type)
{
case Canvas::TYPE_HDR:
internalFormat = GL_RGBA16F;
format = GL_FLOAT;
break;
case Canvas::TYPE_NORMAL:
default:
internalFormat = GL_RGBA8;
format = GL_UNSIGNED_BYTE;
}
glGenTextures(1, &img);
gl.bindTexture(img);
gl.setTextureFilter(Image::getDefaultFilter());
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height,
0, GL_RGBA, format, NULL);
gl.bindTexture(0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, img, 0);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
// check status
GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
// unbind framebuffer
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, (GLuint) current_fbo);
return status;
return glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) == GL_FRAMEBUFFER_COMPLETE_EXT;
}
bool isSupported()
{
GLuint fb, stencil, img;
GLenum status = createFBO(fb, stencil, img, 2, 2, Canvas::TYPE_NORMAL);
GLuint fb = 0, stencil = 0, img = 0;
GLenum status = createFBO(fb, img, 2, 2, Canvas::TYPE_NORMAL);
deleteFBO(fb, stencil, img);
return status == GL_FRAMEBUFFER_COMPLETE;
}
@@ -619,6 +614,25 @@ void Canvas::drawg(love::graphics::Geometry *geom, float x, float y, float angle
delete[] v;
}
bool Canvas::checkCreateStencil()
{
// Do nothing if we've already created the stencil buffer.
if (depth_stencil)
return true;
if (current != this)
strategy->bindFBO(fbo);
bool success = strategy->createStencil(width, height, depth_stencil);
if (current && current != this)
strategy->bindFBO(current->fbo);
else if (!current)
strategy->bindFBO(0);
return success;
}
love::image::ImageData *Canvas::getImageData(love::image::Image *image)
{
int row = 4 * width;
@@ -689,7 +703,7 @@ Image::Wrap Canvas::getWrap() const
bool Canvas::loadVolatile()
{
status = strategy->createFBO(fbo, depth_stencil, img, width, height, texture_type);
status = strategy->createFBO(fbo, img, width, height, texture_type);
if (status != GL_FRAMEBUFFER_COMPLETE)
return false;