6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-12-27 16:31:31 +00:00
Code Issues Projects Releases Wiki Activity

Switched to an in-framebuffer approach to phosphor decay, which might be acceptable now that every single pixel is being painted, re-emphasises luminance and stretched sampling period for the two FIR filters as well as decreasing the amount of signal that is retained, subjectively to improve output.

Browse Source
This commit is contained in:
Thomas Harte 2016-04-24 06:16:41 -04:00
parent c123f3bf74
commit bdaf4cee43
1 changed files with 28 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
Outputs/CRT/Internals/CRTOpenGL.cpp
View File

@ -93,7 +93,7 @@ OpenGLOutputBuilder::OpenGLOutputBuilder(unsigned int buffer_depth) :
}
_buffer_builder = std::unique_ptr<CRTInputBufferBuilder>(new CRTInputBufferBuilder(buffer_depth));
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// Create intermediate textures and bind to slots 0, 1 and 2
glActiveTexture(composite_texture_unit);
@ -435,19 +435,19 @@ char *OpenGLOutputBuilder::get_input_vertex_shader(const char *input_position, c
"inputPositionVarying = (extendedInputPosition + vec2(0.0, 0.5)) / textureSize;"
"textureSize = textureSize * vec2(1.0);"
"inputPositionsVarying[0] = inputPositionVarying - (vec2(5.0, 0.0) / textureSize);"
"inputPositionsVarying[1] = inputPositionVarying - (vec2(4.0, 0.0) / textureSize);"
"inputPositionsVarying[2] = inputPositionVarying - (vec2(3.0, 0.0) / textureSize);"
"inputPositionsVarying[3] = inputPositionVarying - (vec2(2.0, 0.0) / textureSize);"
"inputPositionsVarying[4] = inputPositionVarying - (vec2(1.0, 0.0) / textureSize);"
"inputPositionsVarying[0] = inputPositionVarying - (vec2(10.0, 0.0) / textureSize);"
"inputPositionsVarying[1] = inputPositionVarying - (vec2(8.0, 0.0) / textureSize);"
"inputPositionsVarying[2] = inputPositionVarying - (vec2(6.0, 0.0) / textureSize);"
"inputPositionsVarying[3] = inputPositionVarying - (vec2(4.0, 0.0) / textureSize);"
"inputPositionsVarying[4] = inputPositionVarying - (vec2(2.0, 0.0) / textureSize);"
"inputPositionsVarying[5] = inputPositionVarying;"
"inputPositionsVarying[6] = inputPositionVarying + (vec2(1.0, 0.0) / textureSize);"
"inputPositionsVarying[7] = inputPositionVarying + (vec2(2.0, 0.0) / textureSize);"
"inputPositionsVarying[8] = inputPositionVarying + (vec2(3.0, 0.0) / textureSize);"
"inputPositionsVarying[9] = inputPositionVarying + (vec2(4.0, 0.0) / textureSize);"
"inputPositionsVarying[10] = inputPositionVarying + (vec2(5.0, 0.0) / textureSize);"
"inputPositionsVarying[6] = inputPositionVarying + (vec2(2.0, 0.0) / textureSize);"
"inputPositionsVarying[7] = inputPositionVarying + (vec2(4.0, 0.0) / textureSize);"
"inputPositionsVarying[8] = inputPositionVarying + (vec2(6.0, 0.0) / textureSize);"
"inputPositionsVarying[9] = inputPositionVarying + (vec2(8.0, 0.0) / textureSize);"
"inputPositionsVarying[10] = inputPositionVarying + (vec2(10.0, 0.0) / textureSize);"
"phaseVarying = (phaseCyclesPerTick * (extendedOutputPosition.x - phaseTime) + phaseAmplitudeAndOffset.x) * 2.0 * 3.141592654;"
"amplitudeVarying = 0.33;" // phaseAmplitudeAndOffset.y
@ -546,7 +546,7 @@ char *OpenGLOutputBuilder::get_y_filter_fragment_shader()
"dot(samples[0], weights[0]),"
"dot(samples[1], weights[1]),"
"dot(samples[2], weights[2])"
"), vec3(1.0));"
"), vec3(1.0)) / (1.0 - amplitudeVarying);"
"float chrominance = 0.5 * (samples[1].y - luminance) / amplitudeVarying;"
"vec2 quadrature = vec2(sin(phaseVarying), cos(phaseVarying));"
@ -575,17 +575,17 @@ char *OpenGLOutputBuilder::get_chrominance_filter_fragment_shader()
"{"
"vec3 centreSample = texture(texID, inputPositionsVarying[5]).rgb;"
"vec2 samples[] = vec2[]("
"texture(texID, inputPositionsVarying[0]).gb,"
"texture(texID, inputPositionsVarying[1]).gb,"
"texture(texID, inputPositionsVarying[2]).gb,"
"texture(texID, inputPositionsVarying[3]).gb,"
"texture(texID, inputPositionsVarying[4]).gb,"
"centreSample.gb,"
"texture(texID, inputPositionsVarying[6]).gb,"
"texture(texID, inputPositionsVarying[7]).gb,"
"texture(texID, inputPositionsVarying[8]).gb,"
"texture(texID, inputPositionsVarying[9]).gb,"
"texture(texID, inputPositionsVarying[10]).gb"
"texture(texID, inputPositionsVarying[0]).gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[1]).gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[2]).gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[3]).gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[4]).gb - vec2(0.5),"
"centreSample.gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[6]).gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[7]).gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[8]).gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[9]).gb - vec2(0.5),"
"texture(texID, inputPositionsVarying[10]).gb - vec2(0.5)"
");"
"vec4 channel1[] = vec4[]("
@ -604,12 +604,12 @@ char *OpenGLOutputBuilder::get_chrominance_filter_fragment_shader()
"dot(channel1[0], weights[0]),"
"dot(channel1[1], weights[1]),"
"dot(channel1[2], weights[2])"
"), vec3(1.0, 1.0, 1.0)),"
"), vec3(1.0)) + 0.5,"
"dot(vec3("
"dot(channel2[0], weights[0]),"
"dot(channel2[1], weights[1]),"
"dot(channel2[2], weights[2])"
"), vec3(1.0, 1.0, 1.0))"
"), vec3(1.0)) + 0.5"
");"
"vec3 yuvColourInRange = (yuvColour - vec3(0.0, 0.5, 0.5)) * vec3(1.0, 2.0, 2.0);"
@ -667,7 +667,7 @@ 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 = 15.0*exp(-age*3.0);"
"alpha = 0.75;"//15.0*exp(-age*3.0);"
"vec2 floatingPosition = (position / positionConversion) + lateralAndTimestampBaseOffset.x * scanNormal;"
"vec2 mappedPosition = (floatingPosition - boundsOrigin) / boundsSize;"
@ -775,14 +775,14 @@ void OpenGLOutputBuilder::prepare_composite_input_shader()
float weights[12];
composite_y_filter_shader_program = prepare_intermediate_shader("outputPosition", "uniform sampler2D texID;", get_y_filter_fragment_shader(), composite_texture_unit, true);
SignalProcessing::FIRFilter luminance_filter(11, _cycles_per_line, 0.0f, colour_subcarrier_frequency, SignalProcessing::FIRFilter::DefaultAttenuation);
SignalProcessing::FIRFilter luminance_filter(11, _cycles_per_line * 0.5f, 0.0f, colour_subcarrier_frequency * 0.5f, SignalProcessing::FIRFilter::DefaultAttenuation);
composite_y_filter_shader_program->bind();
weightsUniform = composite_y_filter_shader_program->get_uniform_location("weights");
luminance_filter.get_coefficients(weights);
glUniform4fv(weightsUniform, 3, weights);
composite_chrominance_filter_shader_program = prepare_intermediate_shader("outputPosition", "uniform sampler2D texID;", get_chrominance_filter_fragment_shader(), filtered_y_texture_unit, false);
SignalProcessing::FIRFilter chrominance_filter(11, _cycles_per_line, 0.0f, colour_subcarrier_frequency * 0.5f, SignalProcessing::FIRFilter::DefaultAttenuation);
SignalProcessing::FIRFilter chrominance_filter(11, _cycles_per_line * 0.5f, 0.0f, colour_subcarrier_frequency * 0.5f, SignalProcessing::FIRFilter::DefaultAttenuation);
composite_chrominance_filter_shader_program->bind();
weightsUniform = composite_chrominance_filter_shader_program->get_uniform_location("weights");
chrominance_filter.get_coefficients(weights);