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renderer: fully switch to premultiplied alpha

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This commit is contained in:
vaxerski 2023-08-06 20:33:36 +02:00
parent a077b7a92e
commit 6c10c38481
3 changed files with 16 additions and 24 deletions
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31
src/render/OpenGL.cpp
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@ -118,8 +118,6 @@ void CHyprOpenGLImpl::begin(CMonitor* pMonitor, CRegion* pDamage, bool fake) {
m_RenderData.pCurrentMonData = &m_mMonitorRenderResources[pMonitor];
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &m_iCurrentOutputFb);
m_iWLROutputFb = m_iCurrentOutputFb;
@ -421,9 +419,10 @@ void CHyprOpenGLImpl::clear(const CColor& color) {
}
void CHyprOpenGLImpl::blend(bool enabled) {
if (enabled)
if (enabled) {
glEnable(GL_BLEND);
else
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); // everything is premultiplied
} else
glDisable(GL_BLEND);
m_bBlend = enabled;
@ -494,8 +493,6 @@ void CHyprOpenGLImpl::renderRectWithDamage(wlr_box* box, const CColor& col, CReg
float glMatrix[9];
wlr_matrix_multiply(glMatrix, m_RenderData.projection, matrix);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glUseProgram(m_RenderData.pCurrentMonData->m_shQUAD.program);
#ifndef GLES2
@ -504,7 +501,9 @@ void CHyprOpenGLImpl::renderRectWithDamage(wlr_box* box, const CColor& col, CReg
wlr_matrix_transpose(glMatrix, glMatrix);
glUniformMatrix3fv(m_RenderData.pCurrentMonData->m_shQUAD.proj, 1, GL_FALSE, glMatrix);
#endif
glUniform4f(m_RenderData.pCurrentMonData->m_shQUAD.color, col.r, col.g, col.b, col.a);
// premultiply the color as well as we don't work with straight alpha
glUniform4f(m_RenderData.pCurrentMonData->m_shQUAD.color, col.r * col.a, col.g * col.a, col.b * col.a, col.a);
wlr_box transformedBox;
wlr_box_transform(&transformedBox, box, wlr_output_transform_invert(m_RenderData.pMonitor->transform), m_RenderData.pMonitor->vecTransformedSize.x,
@ -543,8 +542,6 @@ void CHyprOpenGLImpl::renderRectWithDamage(wlr_box* box, const CColor& col, CReg
}
glDisableVertexAttribArray(m_RenderData.pCurrentMonData->m_shQUAD.posAttrib);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
}
void CHyprOpenGLImpl::renderTexture(wlr_texture* tex, wlr_box* pBox, float alpha, int round, bool allowCustomUV) {
@ -588,9 +585,7 @@ void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_b
float glMatrix[9];
wlr_matrix_multiply(glMatrix, m_RenderData.projection, matrix);
CShader* shader = nullptr;
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
CShader* shader = nullptr;
bool usingFinalShader = false;
@ -955,9 +950,6 @@ CFramebuffer* CHyprOpenGLImpl::blurMainFramebufferWithDamage(float a, wlr_box* p
}
// finish
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(PMIRRORFB->m_cTex.m_iTarget, 0);
blend(BLENDBEFORE);
@ -1227,8 +1219,8 @@ void CHyprOpenGLImpl::renderBorder(wlr_box* box, const CGradientValueData& grad,
float glMatrix[9];
wlr_matrix_multiply(glMatrix, m_RenderData.projection, matrix);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
const auto BLEND = m_bBlend;
blend(true);
glUseProgram(m_RenderData.pCurrentMonData->m_shBORDER1.program);
@ -1286,7 +1278,7 @@ void CHyprOpenGLImpl::renderBorder(wlr_box* box, const CGradientValueData& grad,
glDisableVertexAttribArray(m_RenderData.pCurrentMonData->m_shBORDER1.posAttrib);
glDisableVertexAttribArray(m_RenderData.pCurrentMonData->m_shBORDER1.texAttrib);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
blend(BLEND);
}
void CHyprOpenGLImpl::makeRawWindowSnapshot(CWindow* pWindow, CFramebuffer* pFramebuffer) {
@ -1561,7 +1553,6 @@ void CHyprOpenGLImpl::renderRoundedShadow(wlr_box* box, int round, int range, fl
wlr_matrix_multiply(glMatrix, m_RenderData.projection, matrix);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glUseProgram(m_RenderData.pCurrentMonData->m_shSHADOW.program);
@ -1610,8 +1601,6 @@ void CHyprOpenGLImpl::renderRoundedShadow(wlr_box* box, int round, int range, fl
glDisableVertexAttribArray(m_RenderData.pCurrentMonData->m_shSHADOW.posAttrib);
glDisableVertexAttribArray(m_RenderData.pCurrentMonData->m_shSHADOW.texAttrib);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
}
void CHyprOpenGLImpl::saveBufferForMirror() {

4
src/render/shaders/Border.hpp
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@ -111,10 +111,8 @@ void main() {
if (pixColor[3] == 0.0)
discard;
float pixColor3 = pixColor[3];
pixColor = getColorForCoord(v_texcoord);
pixColor[3] *= alpha * pixColor3;
gl_FragColor = pixColor;
gl_FragColor = pixColor * alpha;
}
)#";

5
src/render/shaders/Shadow.hpp
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@ -78,5 +78,10 @@ void main() {
discard; return;
}
// premultiply
pixColor[0] *= pixColor[3];
pixColor[1] *= pixColor[3];
pixColor[2] *= pixColor[3];
gl_FragColor = pixColor;
})#";