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Oh, of course, I can use GL_CONSTANT_ALPHA so that new colours can be painted at alpha 1.0 while possibly saturating with old colours.

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This commit is contained in:
Thomas Harte 2016-04-24 20:47:24 -04:00
parent d221c712b0
commit 2bd6566768
1 changed files with 3 additions and 2 deletions
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5
Outputs/CRT/Internals/CRTOpenGL.cpp
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@ -95,7 +95,8 @@ OpenGLOutputBuilder::OpenGLOutputBuilder(unsigned int buffer_depth) :
}
_buffer_builder = std::unique_ptr<CRTInputBufferBuilder>(new CRTInputBufferBuilder(buffer_depth));
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBlendFunc(GL_SRC_ALPHA, GL_CONSTANT_ALPHA);
glBlendColor(1.0f, 1.0f, 1.0f, 0.33f);
// Create intermediate textures and bind to slots 0, 1 and 2
glActiveTexture(composite_texture_unit);
@ -672,7 +673,7 @@ char *OpenGLOutputBuilder::get_output_vertex_shader(const char *header)
"iSrcCoordinatesVarying = srcCoordinates;"
"srcCoordinatesVarying = vec2(srcCoordinates.x / textureSize.x, (srcCoordinates.y + 0.5) / textureSize.y);"
"float age = (timestampBase[int(lateralAndTimestampBaseOffset.y)] - timestamp) / ticksPerFrame;"
"alpha = 0.75;"//15.0*exp(-age*3.0);"
"alpha = 1.0;"//15.0*exp(-age*3.0);"
"vec2 floatingPosition = (position / positionConversion) + lateralAndTimestampBaseOffset.x * scanNormal;"
"vec2 mappedPosition = (floatingPosition - boundsOrigin) / boundsSize;"