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caching the current active texture slot in GL3 

it reduces the total number of API calls by a good amount
This commit is contained in:
myT 2020-10-08 04:45:33 +02:00
parent 2aaf17b061
commit 249bcb2d07
1 changed files with 16 additions and 9 deletions
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25
code/renderer/tr_backend_gl3.cpp
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@ -249,6 +249,7 @@ struct OpenGL3
ArrayBuffer indexBuffer;
GLuint boundTextures[2];
int activeTextureSlot;
cullType_t cullType;
unsigned int srcBlendBits;
unsigned int dstBlendBits;
@ -1126,6 +1127,17 @@ static void FBO_ResolveColor()
glBlitFramebuffer(0, 0, w, h, 0, 0, w, h, GL_COLOR_BUFFER_BIT, GL_LINEAR);
}
static void ApplyActiveTexture(int slot)
{
if(slot == gl.activeTextureSlot)
{
return;
}
glActiveTexture(GL_TEXTURE0 + slot);
gl.activeTextureSlot = slot;
}
static void ApplyPipeline(PipelineId pipelineId)
{
if(pipelineId == gl.pipelineId)
@ -1165,7 +1177,7 @@ static void ApplyPipeline(PipelineId pipelineId)
}
glUniform1i(pipeline->textureLocations[0], 0);
glActiveTexture(GL_TEXTURE1);
ApplyActiveTexture(1);
if(pipelineId == PID_SOFT_SPRITE && gl.fbMSEnabled)
{
// we don't have a "BindTextureMS" function for caching/tracking MS texture binds
@ -1173,7 +1185,7 @@ static void ApplyPipeline(PipelineId pipelineId)
glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, gl.fbMS.depthStencil);
}
glUniform1i(pipeline->textureLocations[1], 1);
glActiveTexture(GL_TEXTURE0);
ApplyActiveTexture(0);
memset(pipeline->uniformsDirty, 0xFF, sizeof(pipeline->uniformsDirty));
}
@ -1213,6 +1225,7 @@ static void BindTexture(int slot, GLuint texture)
return;
}
ApplyActiveTexture(slot);
glBindTexture(GL_TEXTURE_2D, texture);
gl.boundTextures[slot] = texture;
}
@ -1740,6 +1753,7 @@ static void SetDefaultState()
gl.boundTextures[0] = GLuint(-1);
gl.boundTextures[1] = GLuint(-1);
gl.activeTextureSlot = 0;
gl.cullType = CT_TWO_SIDED;
gl.srcBlendBits = GLS_SRCBLEND_SRC_ALPHA;
gl.dstBlendBits = GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA;
@ -2209,7 +2223,6 @@ static void DrawGeneric()
UploadVertexArray(VB_COLOR, tess.svars[i].colors);
BindBundle(0, &stage->bundle);
glActiveTexture(GL_TEXTURE1);
if(stage->mtStages == 0)
{
@ -2226,8 +2239,6 @@ static void DrawGeneric()
++i;
}
glActiveTexture(GL_TEXTURE0);
if(pipeline->uniformsDirty[GU_ALPHA_TEX])
{
glUniform2ui(pipeline->uniformLocations[GU_ALPHA_TEX], gl.alphaTest, gl.texEnv);
@ -2246,9 +2257,7 @@ static void DrawGeneric()
UploadVertexArray(VB_COLOR, tess.svarsFog.colors);
BindImage(0, tr.fogImage);
glActiveTexture(GL_TEXTURE1);
BindImage(1, tr.whiteImage);
glActiveTexture(GL_TEXTURE0);
ApplyTexEnv(TE_DISABLED);
if(pipeline->uniformsDirty[GU_ALPHA_TEX])
@ -2385,9 +2394,7 @@ static void DrawDepthFade()
BindBundle(0, &stage->bundle);
if(!gl.fbMSEnabled)
{
glActiveTexture(GL_TEXTURE1);
BindTexture(1, gl.fbSS[gl.fbReadIndex].depthStencil);
glActiveTexture(GL_TEXTURE0);
}
DrawElements(tess.numIndexes);