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- changed alpha texture handling to avoid using the deprecated GL_ALPHA8 texture format unless we have a compatibility context of an older GL version.
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ca76c2525e
commit
d5dceb6874
4 changed files with 50 additions and 9 deletions
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@ -153,7 +153,6 @@ void gl_LoadExtensions()
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{
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gl.flags|=RFL_FRAMEBUFFER;
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}
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}
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//==========================================================================
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@ -41,6 +41,11 @@ struct RenderContext
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{
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return glslversion >= 1.3f;
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}
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bool hasCompatibility() // will return false, once transition to a core profile is possible and a core profile is used.
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{
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return true;
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}
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};
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extern RenderContext gl;
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@ -42,6 +42,7 @@
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#include "gl/renderer/gl_lightdata.h"
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#include "gl/textures/gl_translate.h"
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#include "gl/textures/gl_bitmap.h"
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#include "gl/system/gl_interface.h"
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//===========================================================================
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//
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@ -54,7 +55,7 @@ void iCopyColors(unsigned char * pout, const unsigned char * pin, bool alphatex,
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{
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int i;
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if (!alphatex)
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if (!alphatex || gl.version >= 3.3f) // GL 3.3+ uses a GL_R8 texture for alpha textures so the channels can remain as they are.
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{
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for(i=0;i<count;i++)
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{
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@ -139,12 +140,25 @@ void FGLBitmap::CopyPixelData(int originx, int originy, const BYTE * patch, int
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// alpha map with 0==transparent and 1==opaque
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if (alphatex)
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{
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for(int i=0;i<256;i++)
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if (gl.version < 3.3f)
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{
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if (palette[i].a != 0)
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penew[i]=PalEntry(i, 255,255,255);
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else
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penew[i]=PalEntry(0,255,255,255); // If the palette contains transparent colors keep them.
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for (int i = 0; i<256; i++)
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{
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if (palette[i].a != 0)
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penew[i] = PalEntry(i, 255, 255, 255);
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else
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penew[i] = PalEntry(0, 255, 255, 255); // If the palette contains transparent colors keep them.
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}
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}
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else // on GL 3.3+ we use a GL_R8 texture so the layout is different.
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{
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for (int i = 0; i<256; i++)
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{
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if (palette[i].a != 0)
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penew[i] = PalEntry(255, i, 255, 255);
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else
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penew[i] = PalEntry(255, 0, 255, 255); // If the palette contains transparent colors keep them.
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}
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}
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}
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else if (translation > 0)
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@ -190,8 +190,26 @@ void FHardwareTexture::LoadImage(unsigned char * buffer,int w, int h, unsigned i
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bool deletebuffer=false;
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bool use_mipmapping = TexFilter[gl_texture_filter].mipmapping;
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if (alphatexture) texformat=GL_ALPHA8;
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else if (forcenocompression) texformat = GL_RGBA8;
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if (alphatexture)
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{
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// thanks to deprecation and delayed introduction of a suitable replacement feature this has become a bit messy...
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if (gl.version >= 3.3f)
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{
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texformat = GL_R8;
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}
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else if (gl.version <= 3.0f || gl.hasCompatibility())
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{
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texformat = GL_ALPHA8;
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}
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else
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{
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texformat = GL_RGBA8;
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}
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}
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else if (forcenocompression)
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{
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texformat = GL_RGBA8;
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}
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if (glTexID==0) glGenTextures(1,&glTexID);
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glBindTexture(GL_TEXTURE_2D, glTexID);
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lastbound[texunit]=glTexID;
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@ -238,6 +256,11 @@ void FHardwareTexture::LoadImage(unsigned char * buffer,int w, int h, unsigned i
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapparam==GL_CLAMP? GL_CLAMP_TO_EDGE : GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapparam==GL_CLAMP? GL_CLAMP_TO_EDGE : GL_REPEAT);
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if (alphatexture && gl.version >= 3.3f)
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{
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static const GLint swizzleMask[] = {GL_ONE, GL_ONE, GL_ONE, GL_RED};
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glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask);
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}
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clampmode = wrapparam==GL_CLAMP? GLT_CLAMPX|GLT_CLAMPY : 0;
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if (forcenofiltering)
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