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Reduces the number of GL state changes in GUI.

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This was SVN commit r24885.
This commit is contained in:
vladislavbelov
2021-02-11 19:15:35 +00:00
parent 4d083660aa
commit 63e0f13f1b
2 changed files with 20 additions and 11 deletions
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source/gui/GUIRenderer.cpp
+13 -9
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@@ -333,6 +333,9 @@ CRect SDrawCall::ComputeTexCoords() const
void GUIRenderer::Draw(DrawCalls& Calls, float Z)
{
if (Calls.empty())
return;
// Called every frame, to draw the object (based on cached calculations)
// TODO: batching by shader/texture/etc would be nice
@@ -340,6 +343,7 @@ void GUIRenderer::Draw(DrawCalls& Calls, float Z)
CMatrix3D matrix = GetDefaultGuiMatrix();
glDisable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// Iterate through each DrawCall, and execute whatever drawing code is being called
for (DrawCalls::const_iterator cit = Calls.begin(); cit != Calls.end(); ++cit)
@@ -353,11 +357,10 @@ void GUIRenderer::Draw(DrawCalls& Calls, float Z)
shader->Uniform(str_color, cit->m_ShaderColorParameter);
shader->BindTexture(str_tex, cit->m_Texture);
if (cit->m_EnableBlending || cit->m_Texture->HasAlpha()) // (shouldn't call HasAlpha before BindTexture)
{
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// Shouldn't call HasAlpha before BindTexture.
const bool needsBlend = cit->m_EnableBlending || cit->m_Texture->HasAlpha();
if (needsBlend)
glEnable(GL_BLEND);
}
CRect TexCoords = cit->ComputeTexCoords();
@@ -388,16 +391,16 @@ void GUIRenderer::Draw(DrawCalls& Calls, float Z)
shader->TexCoordPointer(GL_TEXTURE0, 2, GL_FLOAT, 5*sizeof(float), &data[0]);
shader->VertexPointer(3, GL_FLOAT, 5*sizeof(float), &data[2]);
glDrawArrays(GL_TRIANGLES, 0, 6);
if (needsBlend)
glDisable(GL_BLEND);
}
else
{
shader->Uniform(str_color, *cit->m_BackColor);
if (cit->m_EnableBlending)
{
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
}
// Ensure the quad has the correct winding order
CRect Verts = cit->m_Vertices;
@@ -432,11 +435,12 @@ void GUIRenderer::Draw(DrawCalls& Calls, float Z)
shader->VertexPointer(3, GL_FLOAT, 3*sizeof(float), &data[0]);
glDrawArrays(GL_LINE_LOOP, 0, 4);
}
if (cit->m_EnableBlending)
glDisable(GL_BLEND);
#undef ADD
}
cit->m_Shader->EndPass();
glDisable(GL_BLEND);
}
}