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Returns gamma correction, and corrects Amstrad CPC brightness.

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Thomas Harte
2019-01-14 22:56:08 -05:00
parent 55290f4dad
commit 6c49953115
6 changed files with 24 additions and 5 deletions
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Outputs/OpenGL/ScanTargetGLSLFragments.cpp
+11 -2
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@@ -180,7 +180,7 @@ std::unique_ptr<Shader> ScanTarget::composition_shader(InputDataType input_data_
));
}
std::unique_ptr<Shader> ScanTarget::conversion_shader(InputDataType input_data_type, DisplayType display_type, ColourSpace colour_space) {
std::unique_ptr<Shader> ScanTarget::conversion_shader(InputDataType input_data_type, DisplayType display_type, ColourSpace colour_space, float gamma_ratio, float brightness) {
// Compose a vertex shader. If the display type is RGB, generate just the proper
// geometry position, plus a solitary textureCoordinate.
//
@@ -451,7 +451,16 @@ std::unique_ptr<Shader> ScanTarget::conversion_shader(InputDataType input_data_t
break;
}
// TODO gamma and range corrections.
// Apply a brightness adjustment if requested.
if(fabs(brightness - 1.0f) > 0.05f) {
fragment_shader += "fragColour3 = fragColour3 * " + std::to_string(brightness) + ";";
}
// Apply a gamma correction if required.
if(fabs(gamma_ratio - 1.0f) > 0.05f) {
fragment_shader += "fragColour3 = pow(fragColour3, vec3(" + std::to_string(gamma_ratio) + "));";
}
fragment_shader +=
"fragColour = vec4(fragColour3, 0.64);"
"}";