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https://github.com/TomHarte/CLK.git
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Switched wholeheartedly to the new shader.
This commit is contained in:
Thomas Harte
parent
8538b62ea2
commit
e6c3b148ac
@ -359,263 +359,21 @@ void OpenGLOutputBuilder::set_rgb_sampling_function(const char *shader)
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_rgb_shader = strdup(shader);
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}
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#pragma mark - Input vertex shader (i.e. from source data to intermediate line layout)
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char *OpenGLOutputBuilder::get_input_vertex_shader(const char *input_position, const char *header)
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{
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char *result;
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asprintf(&result,
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"#version 150\n"
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"in vec2 inputPosition;"
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"in vec2 outputPosition;"
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"in vec3 phaseAmplitudeAndOffset;"
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"in float phaseTime;"
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"uniform float phaseCyclesPerTick;"
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"uniform ivec2 outputTextureSize;"
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"uniform float extension;"
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"\n%s\n"
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"out vec2 inputPositionVarying;"
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"out vec2 iInputPositionVarying;"
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"out float phaseVarying;"
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"out float amplitudeVarying;"
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"out vec2 inputPositionsVarying[11];"
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"void main(void)"
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"{"
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"vec2 extensionVector = vec2(extension, 0.0) * 2.0 * (phaseAmplitudeAndOffset.z - 0.5);"
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"vec2 extendedInputPosition = %s + extensionVector;"
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"vec2 extendedOutputPosition = outputPosition + extensionVector;"
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"vec2 textureSize = vec2(textureSize(texID, 0));"
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"iInputPositionVarying = extendedInputPosition;"
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"inputPositionVarying = (extendedInputPosition + vec2(0.0, 0.5)) / textureSize;"
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"textureSize = textureSize * vec2(1.0);"
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"inputPositionsVarying[0] = inputPositionVarying - (vec2(10.0, 0.0) / textureSize);"
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"inputPositionsVarying[1] = inputPositionVarying - (vec2(8.0, 0.0) / textureSize);"
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"inputPositionsVarying[2] = inputPositionVarying - (vec2(6.0, 0.0) / textureSize);"
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"inputPositionsVarying[3] = inputPositionVarying - (vec2(4.0, 0.0) / textureSize);"
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"inputPositionsVarying[4] = inputPositionVarying - (vec2(2.0, 0.0) / textureSize);"
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"inputPositionsVarying[5] = inputPositionVarying;"
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"inputPositionsVarying[6] = inputPositionVarying + (vec2(2.0, 0.0) / textureSize);"
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"inputPositionsVarying[7] = inputPositionVarying + (vec2(4.0, 0.0) / textureSize);"
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"inputPositionsVarying[8] = inputPositionVarying + (vec2(6.0, 0.0) / textureSize);"
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"inputPositionsVarying[9] = inputPositionVarying + (vec2(8.0, 0.0) / textureSize);"
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"inputPositionsVarying[10] = inputPositionVarying + (vec2(10.0, 0.0) / textureSize);"
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"phaseVarying = (phaseCyclesPerTick * (extendedOutputPosition.x - phaseTime) + phaseAmplitudeAndOffset.x) * 2.0 * 3.141592654;"
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"amplitudeVarying = 0.33;" // phaseAmplitudeAndOffset.y
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"vec2 eyePosition = 2.0*(extendedOutputPosition / outputTextureSize) - vec2(1.0) + vec2(0.5)/textureSize;"
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"gl_Position = vec4(eyePosition, 0.0, 1.0);"
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"}", header, input_position);
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return result;
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}
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char *OpenGLOutputBuilder::get_input_fragment_shader()
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{
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char *composite_shader = _composite_shader;
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if(!composite_shader)
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{
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asprintf(&composite_shader,
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"%s\n"
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"uniform mat3 rgbToLumaChroma;"
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"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
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"{"
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"vec3 rgbColour = clamp(rgb_sample(texID, coordinate, iCoordinate), vec3(0.0), vec3(1.0));"
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"vec3 lumaChromaColour = rgbToLumaChroma * rgbColour;"
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"vec2 quadrature = vec2(cos(phase), -sin(phase)) * amplitude;"
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"return dot(lumaChromaColour, vec3(1.0 - amplitude, quadrature));"
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"}",
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_rgb_shader);
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// TODO: use YIQ if this is NTSC
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}
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char *result;
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asprintf(&result,
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"#version 150\n"
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"in vec2 inputPositionVarying;"
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"in vec2 iInputPositionVarying;"
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"in float phaseVarying;"
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"in float amplitudeVarying;"
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"out vec4 fragColour;"
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"uniform usampler2D texID;"
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"\n%s\n"
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"void main(void)"
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"{"
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"fragColour = vec4(composite_sample(texID, inputPositionVarying, iInputPositionVarying, phaseVarying, amplitudeVarying));"
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"}"
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, composite_shader);
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if(!_composite_shader) free(composite_shader);
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return result;
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}
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char *OpenGLOutputBuilder::get_y_filter_fragment_shader()
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{
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return strdup(
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"#version 150\n"
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"in float phaseVarying;"
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"in float amplitudeVarying;"
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"in vec2 inputPositionsVarying[11];"
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"uniform vec4 weights[3];"
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"out vec3 fragColour;"
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"uniform sampler2D texID;"
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"void main(void)"
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"{"
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"vec4 samples[3] = vec4[]("
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"vec4("
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"texture(texID, inputPositionsVarying[0]).r,"
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"texture(texID, inputPositionsVarying[1]).r,"
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"texture(texID, inputPositionsVarying[2]).r,"
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"texture(texID, inputPositionsVarying[3]).r"
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"),"
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"vec4("
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"texture(texID, inputPositionsVarying[4]).r,"
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"texture(texID, inputPositionsVarying[5]).r,"
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"texture(texID, inputPositionsVarying[6]).r,"
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"texture(texID, inputPositionsVarying[7]).r"
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"),"
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"vec4("
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"texture(texID, inputPositionsVarying[8]).r,"
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"texture(texID, inputPositionsVarying[9]).r,"
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"texture(texID, inputPositionsVarying[10]).r,"
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"0.0"
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")"
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");"
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"float luminance = "
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"dot(vec3("
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"dot(samples[0], weights[0]),"
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"dot(samples[1], weights[1]),"
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"dot(samples[2], weights[2])"
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"), vec3(1.0)) / (1.0 - amplitudeVarying);"
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"float chrominance = 0.5 * (samples[1].y - luminance) / amplitudeVarying;"
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"vec2 quadrature = vec2(cos(phaseVarying), -sin(phaseVarying));"
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"fragColour = vec3(luminance, vec2(0.5) + (chrominance * quadrature));"
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"}");
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}
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char *OpenGLOutputBuilder::get_chrominance_filter_fragment_shader()
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{
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return strdup(
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"#version 150\n"
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"in float phaseVarying;"
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"in float amplitudeVarying;"
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"in vec2 inputPositionsVarying[11];"
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"uniform vec4 weights[3];"
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"out vec3 fragColour;"
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"uniform sampler2D texID;"
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"uniform mat3 lumaChromaToRGB;"
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"void main(void)"
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"{"
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"vec3 centreSample = texture(texID, inputPositionsVarying[5]).rgb;"
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"vec2 samples[] = vec2[]("
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"texture(texID, inputPositionsVarying[0]).gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[1]).gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[2]).gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[3]).gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[4]).gb - vec2(0.5),"
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"centreSample.gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[6]).gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[7]).gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[8]).gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[9]).gb - vec2(0.5),"
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"texture(texID, inputPositionsVarying[10]).gb - vec2(0.5)"
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");"
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"vec4 channel1[] = vec4[]("
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"vec4(samples[0].r, samples[1].r, samples[2].r, samples[3].r),"
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"vec4(samples[4].r, samples[5].r, samples[6].r, samples[7].r),"
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"vec4(samples[8].r, samples[9].r, samples[10].r, 0.0)"
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");"
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"vec4 channel2[] = vec4[]("
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"vec4(samples[0].g, samples[1].g, samples[2].g, samples[3].g),"
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"vec4(samples[4].g, samples[5].g, samples[6].g, samples[7].g),"
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"vec4(samples[8].g, samples[9].g, samples[10].g, 0.0)"
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");"
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"vec3 lumaChromaColour = vec3(centreSample.r,"
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"dot(vec3("
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"dot(channel1[0], weights[0]),"
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"dot(channel1[1], weights[1]),"
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"dot(channel1[2], weights[2])"
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"), vec3(1.0)) + 0.5,"
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"dot(vec3("
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"dot(channel2[0], weights[0]),"
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"dot(channel2[1], weights[1]),"
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"dot(channel2[2], weights[2])"
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"), vec3(1.0)) + 0.5"
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");"
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"vec3 lumaChromaColourInRange = (lumaChromaColour - vec3(0.0, 0.5, 0.5)) * vec3(1.0, 2.0, 2.0);"
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"fragColour = lumaChromaToRGB * lumaChromaColourInRange;"
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"}");
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}
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#pragma mark - Intermediate vertex shaders (i.e. from intermediate line layout to intermediate line layout)
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#pragma mark - Program compilation
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std::unique_ptr<OpenGL::Shader> OpenGLOutputBuilder::prepare_intermediate_shader(const char *input_position, const char *header, char *fragment_shader, GLenum texture_unit, bool extends)
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{
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std::unique_ptr<OpenGL::Shader> shader;
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char *vertex_shader = get_input_vertex_shader(input_position, header);
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if(vertex_shader && fragment_shader)
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{
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OpenGL::Shader::AttributeBinding bindings[] =
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{
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{"inputPosition", 0},
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{"outputPosition", 1},
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{"phaseAmplitudeAndOffset", 2},
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{"phaseTime", 3},
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{nullptr}
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};
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shader = std::unique_ptr<OpenGL::Shader>(new OpenGL::Shader(vertex_shader, fragment_shader, bindings));
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GLint texIDUniform = shader->get_uniform_location("texID");
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GLint outputTextureSizeUniform = shader->get_uniform_location("outputTextureSize");
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shader->bind();
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glUniform1i(texIDUniform, (GLint)(texture_unit - GL_TEXTURE0));
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glUniform2i(outputTextureSizeUniform, IntermediateBufferWidth, IntermediateBufferHeight);
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}
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free(vertex_shader);
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free(fragment_shader);
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return shader;
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}
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void OpenGLOutputBuilder::prepare_composite_input_shader()
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{
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composite_input_shader_program = prepare_intermediate_shader("inputPosition", "uniform usampler2D texID;", get_input_fragment_shader(), source_data_texture_unit, false);
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composite_y_filter_shader_program = prepare_intermediate_shader("outputPosition", "uniform sampler2D texID;", get_y_filter_fragment_shader(), composite_texture_unit, true);
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composite_chrominance_filter_shader_program = prepare_intermediate_shader("outputPosition", "uniform sampler2D texID;", get_chrominance_filter_fragment_shader(), filtered_y_texture_unit, true);
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composite_input_shader_program = OpenGL::IntermediateShader::make_source_conversion_shader(_composite_shader, _rgb_shader);
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composite_input_shader_program->set_source_texture_unit(source_data_texture_unit);
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composite_input_shader_program->set_output_size(IntermediateBufferWidth, IntermediateBufferHeight);
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composite_y_filter_shader_program = OpenGL::IntermediateShader::make_chroma_luma_separation_shader();
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composite_y_filter_shader_program->set_source_texture_unit(composite_texture_unit);
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composite_y_filter_shader_program->set_output_size(IntermediateBufferWidth, IntermediateBufferHeight);
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composite_chrominance_filter_shader_program = OpenGL::IntermediateShader::make_chroma_filter_shader();
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composite_chrominance_filter_shader_program->set_source_texture_unit(filtered_y_texture_unit);
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composite_chrominance_filter_shader_program->set_output_size(IntermediateBufferWidth, IntermediateBufferHeight);
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}
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void OpenGLOutputBuilder::prepare_source_vertex_array()
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@ -735,49 +493,24 @@ void OpenGLOutputBuilder::set_colour_space_uniforms()
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break;
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}
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if(composite_input_shader_program)
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{
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composite_input_shader_program->bind();
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GLint uniform = composite_input_shader_program->get_uniform_location("rgbToLumaChroma");
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if(uniform >= 0)
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{
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glUniformMatrix3fv(uniform, 1, GL_FALSE, fromRGB);
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}
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}
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if(composite_chrominance_filter_shader_program)
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{
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composite_chrominance_filter_shader_program->bind();
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GLint uniform = composite_chrominance_filter_shader_program->get_uniform_location("lumaChromaToRGB");
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if(uniform >= 0)
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{
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glUniformMatrix3fv(uniform, 1, GL_FALSE, toRGB);
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}
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}
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if(composite_input_shader_program) composite_input_shader_program->set_colour_conversion_matrices(fromRGB, toRGB);
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if(composite_chrominance_filter_shader_program) composite_chrominance_filter_shader_program->set_colour_conversion_matrices(fromRGB, toRGB);
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_output_mutex->unlock();
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}
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void OpenGLOutputBuilder::set_timing_uniforms()
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{
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_output_mutex->lock();
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OpenGL::Shader *intermediate_shaders[] = {
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OpenGL::IntermediateShader *intermediate_shaders[] = {
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composite_input_shader_program.get(),
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composite_y_filter_shader_program.get(),
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composite_chrominance_filter_shader_program.get()
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};
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bool extends = false;
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float phaseCyclesPerTick = (float)_colour_cycle_numerator / (float)(_colour_cycle_denominator * _cycles_per_line);
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for(int c = 0; c < 3; c++)
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{
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if(intermediate_shaders[c])
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{
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intermediate_shaders[c]->bind();
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GLint phaseCyclesPerTickUniform = intermediate_shaders[c]->get_uniform_location("phaseCyclesPerTick");
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GLint extensionUniform = intermediate_shaders[c]->get_uniform_location("extension");
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float phaseCyclesPerTick = (float)_colour_cycle_numerator / (float)(_colour_cycle_denominator * _cycles_per_line);
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glUniform1f(phaseCyclesPerTickUniform, phaseCyclesPerTick);
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glUniform1f(extensionUniform, extends ? ceilf(1.0f / phaseCyclesPerTick) : 0.0f);
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}
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if(intermediate_shaders[c]) intermediate_shaders[c]->set_phase_cycles_per_sample(phaseCyclesPerTick, extends);
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extends = true;
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}
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@ -787,32 +520,11 @@ void OpenGLOutputBuilder::set_timing_uniforms()
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};
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for(int c = 0; c < 2; c++)
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{
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if(output_shaders[c])
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{
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output_shaders[c]->set_timing(_height_of_display, _cycles_per_line, _horizontal_scan_period, _vertical_scan_period, _vertical_period_divider);
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}
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if(output_shaders[c]) output_shaders[c]->set_timing(_height_of_display, _cycles_per_line, _horizontal_scan_period, _vertical_scan_period, _vertical_period_divider);
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}
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float colour_subcarrier_frequency = (float)_colour_cycle_numerator / (float)_colour_cycle_denominator;
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GLint weightsUniform;
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float weights[12];
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if(composite_y_filter_shader_program)
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{
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SignalProcessing::FIRFilter luminance_filter(11, _cycles_per_line * 0.5f, 0.0f, colour_subcarrier_frequency * 0.5f, SignalProcessing::FIRFilter::DefaultAttenuation);
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composite_y_filter_shader_program->bind();
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weightsUniform = composite_y_filter_shader_program->get_uniform_location("weights");
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luminance_filter.get_coefficients(weights);
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glUniform4fv(weightsUniform, 3, weights);
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}
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if(composite_chrominance_filter_shader_program)
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{
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SignalProcessing::FIRFilter chrominance_filter(11, _cycles_per_line * 0.5f, 0.0f, colour_subcarrier_frequency * 0.5f, SignalProcessing::FIRFilter::DefaultAttenuation);
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composite_chrominance_filter_shader_program->bind();
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weightsUniform = composite_chrominance_filter_shader_program->get_uniform_location("weights");
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chrominance_filter.get_coefficients(weights);
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glUniform4fv(weightsUniform, 3, weights);
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}
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if(composite_y_filter_shader_program) composite_y_filter_shader_program->set_filter_coefficients(_cycles_per_line, colour_subcarrier_frequency * 0.5f);
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if(composite_chrominance_filter_shader_program) composite_chrominance_filter_shader_program->set_filter_coefficients(_cycles_per_line, colour_subcarrier_frequency * 0.5f);
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_output_mutex->unlock();
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}
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@ -17,6 +17,7 @@
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#include "CRTInputBufferBuilder.hpp"
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#include "Shaders/OutputShader.hpp"
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#include "Shaders/IntermediateShader.hpp"
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#include <mutex>
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@ -70,14 +71,11 @@ class OpenGLOutputBuilder {
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char *get_chrominance_filter_fragment_shader();
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std::unique_ptr<OpenGL::OutputShader> rgb_shader_program, composite_output_shader_program;
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std::unique_ptr<OpenGL::Shader> composite_input_shader_program, composite_y_filter_shader_program, composite_chrominance_filter_shader_program;
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std::unique_ptr<OpenGL::IntermediateShader> composite_input_shader_program, composite_y_filter_shader_program, composite_chrominance_filter_shader_program;
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GLuint output_array_buffer, output_vertex_array;
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GLuint source_array_buffer, source_vertex_array;
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GLint windowSizeUniform, timestampBaseUniform;
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GLint boundsOriginUniform, boundsSizeUniform;
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GLuint textureName, shadowMaskTextureName;
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||||
|
||||
GLuint defaultFramebuffer;
|
||||
|
||||
@ -264,7 +264,11 @@ void IntermediateShader::set_filter_coefficients(float sampling_rate, float cuto
|
||||
{
|
||||
bind();
|
||||
|
||||
sampling_rate *= 0.5f;
|
||||
cutoff_frequency *= 0.5f;
|
||||
|
||||
float weights[12];
|
||||
weights[11] = 0.0f;
|
||||
SignalProcessing::FIRFilter luminance_filter(11, sampling_rate, 0.0f, cutoff_frequency, SignalProcessing::FIRFilter::DefaultAttenuation);
|
||||
luminance_filter.get_coefficients(weights);
|
||||
glUniform4fv(weightsUniform, 3, weights);
|
||||
|
||||
@ -25,8 +25,7 @@ public:
|
||||
static std::unique_ptr<IntermediateShader> make_chroma_filter_shader();
|
||||
|
||||
/*!
|
||||
Binds this shader and configures it for output to an area of `output_width` and `output_height` pixels, ensuring
|
||||
the largest possible drawing size that allows everything within `visible_area` to be visible.
|
||||
Binds this shader and configures it for output to an area of `output_width` and `output_height` pixels.
|
||||
*/
|
||||
void set_output_size(unsigned int output_width, unsigned int output_height);
|
||||
|
||||
@ -35,10 +34,20 @@ public:
|
||||
*/
|
||||
void set_source_texture_unit(GLenum unit);
|
||||
|
||||
/*!
|
||||
Binds this shader and sets filtering coefficients for a lowpass filter based on the cutoff.
|
||||
*/
|
||||
void set_filter_coefficients(float sampling_rate, float cutoff_frequency);
|
||||
|
||||
/*!
|
||||
Binds this shader and sets the number of colour phase cycles per sample, indicating whether output
|
||||
geometry should be extended so that a complete colour cycle is included at both the beginning and end.
|
||||
*/
|
||||
void set_phase_cycles_per_sample(float phase_cycles_per_sample, bool extend_runs_to_full_cycle);
|
||||
|
||||
/*!
|
||||
Binds this shader and sets the matrices that convert between RGB and chrominance/luminance.
|
||||
*/
|
||||
void set_colour_conversion_matrices(float *fromRGB, float *toRGB);
|
||||
|
||||
private:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user