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Removed any improper talk of YUV. Switched to (cos, -sin) formulation of the quadrature vector, which I now believe to be correct.

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This commit is contained in:
Thomas Harte 2016-04-24 20:27:03 -04:00
parent d393776677
commit acab22d95a
1 changed files with 15 additions and 15 deletions
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30
Outputs/CRT/Internals/CRTOpenGL.cpp
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@ -470,13 +470,13 @@ char *OpenGLOutputBuilder::get_input_fragment_shader()
{
asprintf(&composite_shader,
"%s\n"
"uniform mat3 rgbToYUV;"
"uniform mat3 rgbToLumaChroma;"
"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
"{"
"vec3 rgbColour = clamp(rgb_sample(texID, coordinate, iCoordinate), vec3(0.0), vec3(1.0));"
"vec3 yuvColour = rgbToYUV * rgbColour;"
"vec2 quadrature = vec2(sin(phase), cos(phase)) * amplitude;"
"return dot(yuvColour, vec3(1.0 - amplitude, quadrature));"
"vec3 lumaChromaColour = rgbToLumaChroma * rgbColour;"
"vec2 quadrature = vec2(cos(phase), -sin(phase)) * amplitude;"
"return dot(lumaChromaColour, vec3(1.0 - amplitude, quadrature));"
"}",
_rgb_shader);
// TODO: use YIQ if this is NTSC
@ -554,7 +554,7 @@ char *OpenGLOutputBuilder::get_y_filter_fragment_shader()
"), vec3(1.0)) / (1.0 - amplitudeVarying);"
"float chrominance = 0.5 * (samples[1].y - luminance) / amplitudeVarying;"
"vec2 quadrature = vec2(sin(phaseVarying), cos(phaseVarying));"
"vec2 quadrature = vec2(cos(phaseVarying), -sin(phaseVarying));"
"fragColour = vec3(luminance, vec2(0.5) + (chrominance * quadrature));"
"}");
@ -574,7 +574,7 @@ char *OpenGLOutputBuilder::get_chrominance_filter_fragment_shader()
"out vec3 fragColour;"
"uniform sampler2D texID;"
"uniform mat3 yuvToRGB;"
"uniform mat3 lumaChromaToRGB;"
"void main(void)"
"{"
@ -604,7 +604,7 @@ char *OpenGLOutputBuilder::get_chrominance_filter_fragment_shader()
"vec4(samples[8].g, samples[9].g, samples[10].g, 0.0)"
");"
"vec3 yuvColour = vec3(centreSample.r,"
"vec3 lumaChromaColour = vec3(centreSample.r,"
"dot(vec3("
"dot(channel1[0], weights[0]),"
"dot(channel1[1], weights[1]),"
@ -617,8 +617,8 @@ char *OpenGLOutputBuilder::get_chrominance_filter_fragment_shader()
"), vec3(1.0)) + 0.5"
");"
"vec3 yuvColourInRange = (yuvColour - vec3(0.0, 0.5, 0.5)) * vec3(1.0, 2.0, 2.0);"
"fragColour = yuvToRGB * yuvColourInRange;"
"vec3 lumaChromaColourInRange = (lumaChromaColour - vec3(0.0, 0.5, 0.5)) * vec3(1.0, 2.0, 2.0);"
"fragColour = lumaChromaToRGB * lumaChromaColourInRange;"
"}");
}
@ -932,20 +932,20 @@ void OpenGLOutputBuilder::set_colour_space_uniforms()
if(composite_input_shader_program)
{
composite_input_shader_program->bind();
GLint rgbToYUVUniform = composite_input_shader_program->get_uniform_location("rgbToYUV");
if(rgbToYUVUniform >= 0)
GLint uniform = composite_input_shader_program->get_uniform_location("rgbToLumaChroma");
if(uniform >= 0)
{
glUniformMatrix3fv(rgbToYUVUniform, 1, GL_FALSE, fromRGB);
glUniformMatrix3fv(uniform, 1, GL_FALSE, fromRGB);
}
}
if(composite_chrominance_filter_shader_program)
{
composite_chrominance_filter_shader_program->bind();
GLint yuvToRGBUniform = composite_chrominance_filter_shader_program->get_uniform_location("yuvToRGB");
if(yuvToRGBUniform >= 0)
GLint uniform = composite_chrominance_filter_shader_program->get_uniform_location("lumaChromaToRGB");
if(uniform >= 0)
{
glUniformMatrix3fv(yuvToRGBUniform, 1, GL_FALSE, toRGB);
glUniformMatrix3fv(uniform, 1, GL_FALSE, toRGB);
}
}
}