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Fixed mipmap generation for pre-FBO systems, fixed NPOT check if mipmap filtering is enabled on an image before the texture is created

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This commit is contained in:
Alexander Szpakowski
2013-01-02 05:29:17 -04:00
parent f067e228b4
commit 2d077758d1
1 changed files with 8 additions and 18 deletions
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src/modules/graphics/opengl/Image.cpp
+8 -18
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@@ -154,7 +154,10 @@ void Image::setFilter(const Image::Filter &f)
if (!hasMipmapSupport())
throw love::Exception("Mipmap filtering is not supported on this system!");
if (width != next_p2(width) || height != next_p2(height))
// some old GPUs/systems claim support for NPOT textures, but fail when generating mipmaps for them
// we can't detect which systems will do this, so it's better to fail gracefully for all NPOT images
int w = int(width), h = int(height);
if (w != next_p2(w) || h != next_p2(h))
throw love::Exception("Could not generate mipmaps: image does not have power of two dimensions!");
GLboolean mipmapscreated;
@@ -170,8 +173,8 @@ void Image::setFilter(const Image::Filter &f)
else if (GLEE_EXT_framebuffer_object)
glGenerateMipmapEXT(GL_TEXTURE_2D);
else
// modify single pixel in texture to trigger mipmap chain generation
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, (GLsizei)width, (GLsizei)height, GL_RGBA, GL_UNSIGNED_BYTE, getData());
// modify single texel in texture to trigger mipmap chain generation
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, data->getData());
}
}
@@ -233,7 +236,8 @@ void Image::unload()
bool Image::loadVolatile()
{
glGetFloatv(GL_MAX_TEXTURE_LOD_BIAS, &maxmipmapsharpness);
if (GLEE_VERSION_1_4 || GLEE_EXT_texture_lod_bias)
glGetFloatv(GL_MAX_TEXTURE_LOD_BIAS, &maxmipmapsharpness);
if (hasNpot())
return loadVolatileNPOT();
@@ -271,13 +275,6 @@ bool Image::loadVolatilePOT()
GL_RGBA,
GL_UNSIGNED_BYTE,
0);
if (hasMipmapSupport())
{
// tell GL to auto-generate mipmaps when texture is modified, if mipmapping is enabled
bool genmipmaps = (filter.mipmap == FILTER_LINEAR) || (filter.mipmap == FILTER_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, genmipmaps ? GL_TRUE : GL_FALSE);
}
glTexSubImage2D(GL_TEXTURE_2D,
0,
@@ -306,13 +303,6 @@ bool Image::loadVolatileNPOT()
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
if (hasMipmapSupport())
{
// tell GL to auto-generate mipmaps when texture is modified, if mipmapping is enabled
bool genmipmaps = (filter.mipmap == FILTER_LINEAR) || (filter.mipmap == FILTER_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, genmipmaps ? GL_TRUE : GL_FALSE);
}
glTexImage2D(GL_TEXTURE_2D,
0,