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https://github.com/TomHarte/CLK.git
synced 2025-01-26 15:32:04 +00:00
Made attempt to introduce final filtering stage and output.
This commit is contained in:
Thomas Harte
parent
23311d633b
commit
95639f1189
@ -255,9 +255,10 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
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};
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OpenGL::Shader *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_y_filter_shader_program.get(),
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composite_chrominance_filter_shader_program.get()
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};
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for(int stage = 0; stage < 2; stage++)
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for(int stage = 0; stage < 3; stage++)
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{
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// switch to the initial texture
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targets[stage]->bind_framebuffer();
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@ -532,7 +533,8 @@ char *OpenGLOutputBuilder::get_y_filter_fragment_shader()
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"0.0"
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")"
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");"
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"vec2 quadrature = vec2(sin(phaseVarying), cos(phaseVarying)) * 0.5;"
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"vec2 quadrature = vec2(sin(phaseVarying), cos(phaseVarying)) * vec2(0.5);"
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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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@ -540,10 +542,70 @@ char *OpenGLOutputBuilder::get_y_filter_fragment_shader()
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"dot(samples[2], weights[2])"
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"), vec3(1.0));"
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"float chrominance = (samples[1].y - luminance) / amplitudeVarying;"
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"fragColour = vec3(luminance, vec2(0.5) + chrominance * quadrature );"
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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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"void main(void)"
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"{"
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// "fragColour = texture(texID, inputPositionsVarying[5]).rgb;"
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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,"
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"texture(texID, inputPositionsVarying[1]).gb,"
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"texture(texID, inputPositionsVarying[2]).gb,"
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"texture(texID, inputPositionsVarying[3]).gb,"
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"texture(texID, inputPositionsVarying[4]).gb,"
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"centreSample.gb,"
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"texture(texID, inputPositionsVarying[6]).gb,"
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"texture(texID, inputPositionsVarying[7]).gb,"
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"texture(texID, inputPositionsVarying[8]).gb,"
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"texture(texID, inputPositionsVarying[9]).gb,"
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"texture(texID, inputPositionsVarying[10]).gb"
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");"
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"vec4 channel1[3] = 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[3] = 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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"fragColour = 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, 1.0, 1.0)),"
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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, 1.0, 1.0))"
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");"
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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 - Output vertex shader
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@ -593,7 +655,7 @@ char *OpenGLOutputBuilder::get_output_vertex_shader(const char *header)
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"iSrcCoordinatesVarying = srcCoordinates;"
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"srcCoordinatesVarying = vec2(srcCoordinates.x / textureSize.x, (srcCoordinates.y + 0.5) / textureSize.y);"
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"float age = (timestampBase[int(lateralAndTimestampBaseOffset.y)] - timestamp) / ticksPerFrame;"
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"alpha = exp(-age*0.5) + 0.2;"
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"alpha = 15.0*exp(-age*3.0);" //+ 0.2
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"vec2 floatingPosition = (position / positionConversion) + lateralAndTimestampBaseOffset.x * scanNormal;"
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"vec2 mappedPosition = (floatingPosition - boundsOrigin) / boundsSize;"
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@ -616,13 +678,20 @@ char *OpenGLOutputBuilder::get_composite_output_vertex_shader()
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char *OpenGLOutputBuilder::get_rgb_output_fragment_shader()
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{
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return get_output_fragment_shader(_rgb_shader, "uniform usampler2D texID;", "rgb_sample(texID, srcCoordinatesVarying, iSrcCoordinatesVarying)");
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return get_output_fragment_shader(_rgb_shader, "uniform usampler2D texID;",
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"vec3 colour = rgb_sample(texID, srcCoordinatesVarying, iSrcCoordinatesVarying);");
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}
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char *OpenGLOutputBuilder::get_composite_output_fragment_shader()
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{
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// "const mat3 yuvToRGB = mat3(1.0, 1.0, 1.0, 0.0, -0.39465, 2.03211, 1.13983, -0.58060, 0.0);"
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return get_output_fragment_shader("", "uniform sampler2D texID;", "texture(texID, srcCoordinatesVarying).rgb");
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return get_output_fragment_shader("",
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"uniform sampler2D texID;"
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"const mat3 yuvToRGB = mat3(1.0, 1.0, 1.0, 0.0, -0.39465, 2.03211, 1.13983, -0.58060, 0.0);",
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"vec3 srcColour = texture(texID, srcCoordinatesVarying).rgb;"
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"vec3 yuvColour = vec3(srcColour.r, (srcColour.gb - vec2(0.5, 0.5)) * vec2(2.0, 2.0));"
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"vec3 colour = yuvToRGB * yuvColour; "
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);
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}
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char *OpenGLOutputBuilder::get_output_fragment_shader(const char *sampling_function, const char *header, const char *fragColour_function)
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@ -644,7 +713,8 @@ char *OpenGLOutputBuilder::get_output_fragment_shader(const char *sampling_funct
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"%s\n"
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"void main(void)"
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"{"
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"fragColour = vec4(%s, clamp(alpha, 0.0, 1.0)*sin(lateralVarying));"
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"\n%s\n"
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"fragColour = vec4(colour, clamp(alpha, 0.0, 1.0)*sin(lateralVarying));"
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"}",
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header, sampling_function, fragColour_function);
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@ -655,6 +725,9 @@ char *OpenGLOutputBuilder::get_output_fragment_shader(const char *sampling_funct
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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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// TODO: at the minute, allowing extensions seems to throw the colour phase out of whack between encoding and decoding. Figure out why.
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extends = false;
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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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@ -693,13 +766,22 @@ void OpenGLOutputBuilder::prepare_composite_input_shader()
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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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float colour_subcarrier_frequency = (float)_colour_cycle_numerator / (float)_colour_cycle_denominator;
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SignalProcessing::FIRFilter luminance_filter(11, _cycles_per_line, 0.0f, colour_subcarrier_frequency - 50, SignalProcessing::FIRFilter::DefaultAttenuation);
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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_y_filter_shader_program->bind();
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GLint weightsUniform = composite_y_filter_shader_program->get_uniform_location("weights");
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GLint weightsUniform;
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float weights[12];
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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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SignalProcessing::FIRFilter luminance_filter(11, _cycles_per_line, 0.0f, colour_subcarrier_frequency - 50, 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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composite_chrominance_filter_shader_program = prepare_intermediate_shader("outputPosition", "uniform sampler2D texID;", get_chrominance_filter_fragment_shader(), filtered_y_texture_unit, false);
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SignalProcessing::FIRFilter chrominance_filter(11, _cycles_per_line, 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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void OpenGLOutputBuilder::prepare_source_vertex_array()
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@ -727,46 +809,6 @@ void OpenGLOutputBuilder::prepare_source_vertex_array()
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}
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}
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/*void OpenGLOutputBuilder::prepare_output_shader(char *fragment_shader)
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{
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char *vertex_shader = get_output_vertex_shader();
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if(vertex_shader && fragment_shader)
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{
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_openGL_state->rgb_shader_program = std::unique_ptr<OpenGL::Shader>(new OpenGL::Shader(vertex_shader, fragment_shader));
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_openGL_state->rgb_shader_program->bind();
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_openGL_state->windowSizeUniform = _openGL_state->rgb_shader_program->get_uniform_location("windowSize");
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_openGL_state->boundsSizeUniform = _openGL_state->rgb_shader_program->get_uniform_location("boundsSize");
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_openGL_state->boundsOriginUniform = _openGL_state->rgb_shader_program->get_uniform_location("boundsOrigin");
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_openGL_state->timestampBaseUniform = _openGL_state->rgb_shader_program->get_uniform_location("timestampBase");
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GLint texIDUniform = _openGL_state->rgb_shader_program->get_uniform_location("texID");
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GLint shadowMaskTexIDUniform = _openGL_state->rgb_shader_program->get_uniform_location("shadowMaskTexID");
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GLint textureSizeUniform = _openGL_state->rgb_shader_program->get_uniform_location("textureSize");
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GLint ticksPerFrameUniform = _openGL_state->rgb_shader_program->get_uniform_location("ticksPerFrame");
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GLint scanNormalUniform = _openGL_state->rgb_shader_program->get_uniform_location("scanNormal");
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GLint positionConversionUniform = _openGL_state->rgb_shader_program->get_uniform_location("positionConversion");
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glUniform1i(texIDUniform, first_supplied_buffer_texture_unit);
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glUniform1i(shadowMaskTexIDUniform, 1);
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glUniform2f(textureSizeUniform, CRTInputBufferBuilderWidth, CRTInputBufferBuilderHeight);
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glUniform1f(ticksPerFrameUniform, (GLfloat)(_cycles_per_line * _height_of_display));
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glUniform2f(positionConversionUniform, _horizontal_flywheel->get_scan_period(), _vertical_flywheel->get_scan_period() / (unsigned int)_vertical_flywheel_output_divider);
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float scan_angle = atan2f(1.0f / (float)_height_of_display, 1.0f);
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float scan_normal[] = { -sinf(scan_angle), cosf(scan_angle)};
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float multiplier = (float)_horizontal_flywheel->get_standard_period() / ((float)_height_of_display * (float)_horizontal_flywheel->get_scan_period());
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scan_normal[0] *= multiplier;
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scan_normal[1] *= multiplier;
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glUniform2f(scanNormalUniform, scan_normal[0], scan_normal[1]);
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}
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free(vertex_shader);
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free(fragment_shader);
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}*/
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std::unique_ptr<OpenGL::Shader> OpenGLOutputBuilder::prepare_output_shader(char *vertex_shader, char *fragment_shader, GLint source_texture_unit)
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{
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std::unique_ptr<OpenGL::Shader> shader_program;
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@ -819,7 +861,7 @@ void OpenGLOutputBuilder::prepare_rgb_output_shader()
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void OpenGLOutputBuilder::prepare_composite_output_shader()
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{
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composite_output_shader_program = prepare_output_shader(get_composite_output_vertex_shader(), get_composite_output_fragment_shader(), filtered_y_texture_unit);
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composite_output_shader_program = prepare_output_shader(get_composite_output_vertex_shader(), get_composite_output_fragment_shader(), filtered_texture_unit);
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}
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void OpenGLOutputBuilder::prepare_output_vertex_array()
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@ -75,10 +75,12 @@ class OpenGLOutputBuilder {
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char *get_input_vertex_shader(const char *input_position, const char *header);
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char *get_input_fragment_shader();
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char *get_y_filter_fragment_shader();
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char *get_chrominance_filter_fragment_shader();
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std::unique_ptr<OpenGL::Shader> rgb_shader_program;
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std::unique_ptr<OpenGL::Shader> composite_input_shader_program, composite_y_filter_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, composite_output_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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