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https://github.com/TomHarte/CLK.git
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It's the worst fragment shader you'll ever see. The worst. But this attempts NTSC composite video emulation, artefacts included.
This commit is contained in:
Thomas Harte
parent
5fe0cff692
commit
cb6e6e8acb
@ -20,7 +20,7 @@ Machine::Machine()
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_horizontalTimer = 0;
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_lastOutputStateDuration = 0;
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_lastOutputState = OutputState::Sync;
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_crt = new Outputs::CRT(228, 262, 1, 4);
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_crt = new Outputs::CRT(228, 262, 1, 1);
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_piaTimerStatus = 0xff;
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memset(_collisions, 0xff, sizeof(_collisions));
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_rom = nullptr;
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@ -46,22 +46,6 @@ void Machine::switch_region()
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void Machine::get_output_pixel(uint8_t *pixel, int offset)
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{
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static const uint8_t palette[16][3] =
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{
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{255, 255, 255}, {253, 250, 115}, {236, 199, 125}, {252, 187, 151},
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{252, 180, 181}, {235, 177, 223}, {211, 178, 250}, {187, 182, 250},
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{164, 186, 250}, {166, 201, 250}, {164, 224, 251}, {165, 251, 213},
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{185, 251, 187}, {201, 250, 168}, {225, 235, 160}, {252, 223, 145}
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};
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static const uint8_t alphaValues[8] =
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{
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// 0, 64, 108, 144, 176, 200, 220, 255
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// };
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//
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// {
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69, 134, 108, 161, 186, 210, 235, 255
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};
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// get the playfield pixel and hence a proposed colour
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uint8_t playfieldPixel = _playfield[offset >> 2];
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uint8_t playfieldColour = ((_playfieldControl&6) == 2) ? _playerColour[offset / 80] : _playfieldColour;
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@ -163,10 +147,7 @@ void Machine::get_output_pixel(uint8_t *pixel, int offset)
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}
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// map that colour to an RGBA
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pixel[0] = palette[outputColour >> 4][0];
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pixel[1] = palette[outputColour >> 4][1];
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pixel[2] = palette[outputColour >> 4][2];
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pixel[3] = alphaValues[(outputColour >> 1)&7];
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*pixel = outputColour;
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}
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// in imputing the knowledge that all we're dealing with is the rollover from 159 to 0,
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@ -249,7 +230,7 @@ void Machine::output_pixels(unsigned int count)
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if(_horizontalTimer < (_vBlankExtend ? 152 : 160))
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{
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if(_outputBuffer)
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get_output_pixel(&_outputBuffer[_lastOutputStateDuration * 4], 159 - _horizontalTimer);
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get_output_pixel(&_outputBuffer[_lastOutputStateDuration], 159 - _horizontalTimer);
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// increment all graphics counters
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increment_object_counter(0);
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@ -179,15 +179,23 @@ const char *vertexShader =
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"in vec2 srcCoordinates;\n"
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"in float lateral;\n"
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"\n"
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"out vec2 srcCoordinatesVarying;\n"
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"out vec2 srcCoordinatesVarying[7];\n"
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"out float lateralVarying;\n"
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"out float phase;\n"
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"\n"
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"uniform vec2 textureSize;\n"
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"\n"
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"void main (void)\n"
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"{\n"
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"srcCoordinatesVarying = vec2(srcCoordinates.x / textureSize.x, (srcCoordinates.y + 0.5) / textureSize.y);\n"
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"srcCoordinatesVarying[2] = vec2(srcCoordinates.x / textureSize.x, (srcCoordinates.y + 0.5) / textureSize.y);\n"
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"srcCoordinatesVarying[0] = srcCoordinatesVarying[2] - vec2(0.4 / textureSize.x, 0.0);\n"
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"srcCoordinatesVarying[1] = srcCoordinatesVarying[2] - vec2(0.2 / textureSize.x, 0.0);\n"
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"srcCoordinatesVarying[4] = srcCoordinatesVarying[2] + vec2(0.4 / textureSize.x, 0.0);\n"
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"srcCoordinatesVarying[3] = srcCoordinatesVarying[2] + vec2(0.2 / textureSize.x, 0.0);\n"
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"srcCoordinatesVarying[5] = srcCoordinatesVarying[2] - vec2(0.1 / textureSize.x, 0.0);\n"
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"srcCoordinatesVarying[6] = srcCoordinatesVarying[2] + vec2(0.1 / textureSize.x, 0.0);\n"
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"lateralVarying = lateral + 1.0707963267949;\n"
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"phase = srcCoordinates.x;\n"
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"gl_Position = vec4(position.x * 2.0 - 1.0, 1.0 - position.y * 2.0 , 0.0, 1.0);\n" // + position.x / 131.0
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"}\n";
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@ -195,16 +203,66 @@ const char *vertexShader =
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const char *fragmentShader =
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"#version 150\n"
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"\n"
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"in vec2 srcCoordinatesVarying;\n"
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"in float lateralVarying;"
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"in vec2 srcCoordinatesVarying[7];\n"
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"in float lateralVarying;\n"
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"in float phase;\n"
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"out vec4 fragColour;\n"
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"\n"
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"uniform sampler2D texID;\n"
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"uniform float alpha;\n"
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"\n"
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"float angles[5];\n"
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"\n"
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"float sample(float c, float angle)\n"
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"{\n"
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"float y = 0.1 + (mod(c * 128.0, 8.0) / 8.0) * 0.9;\n"
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"float rawCh = (c * 16.0);\n"
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"float ch = mod(rawCh, 16.0);\n"
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"float aOffset = 2.0 * 3.141592654 * (ch - mod(ch, 1.0)) / 17.0;\n"
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"return y + step(1.0, rawCh) * (0.1 * sin(angle + aOffset));\n"
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"}\n"
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"\n"
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"void main(void)\n"
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"{\n"
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"fragColour = texture(texID, srcCoordinatesVarying) * vec4(1.0, 1.0, 1.0, 1.0);\n" // .a = sin(lateralVarying)
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"float samples[7];\n"
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"float angles[7], i[5], q[5];\n"
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"\n"
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"angles[0] = mod(phase + 0.6, 1.0) * 2.0 * 3.141592654;\n"
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"angles[1] = mod(phase + 0.8, 1.0) * 2.0 * 3.141592654;\n"
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"angles[2] = mod(phase, 1.0) * 2.0 * 3.141592654;\n"
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"angles[3] = mod(phase + 0.2, 1.0) * 2.0 * 3.141592654;\n"
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"angles[4] = mod(phase + 0.4, 1.0) * 2.0 * 3.141592654;\n"
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"angles[5] = mod(phase + 0.9, 1.0) * 2.0 * 3.141592654;\n"
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"angles[6] = mod(phase + 0.1, 1.0) * 2.0 * 3.141592654;\n"
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"\n"
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"samples[0] = sample(texture(texID, srcCoordinatesVarying[0]).r, angles[0]);\n"
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"samples[1] = sample(texture(texID, srcCoordinatesVarying[1]).r, angles[1]);\n"
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"samples[2] = sample(texture(texID, srcCoordinatesVarying[2]).r, angles[2]);\n"
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"samples[3] = sample(texture(texID, srcCoordinatesVarying[3]).r, angles[3]);\n"
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"samples[4] = sample(texture(texID, srcCoordinatesVarying[4]).r, angles[4]);\n"
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"samples[5] = sample(texture(texID, srcCoordinatesVarying[5]).r, angles[5]);\n"
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"samples[6] = sample(texture(texID, srcCoordinatesVarying[6]).r, angles[6]);\n"
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"float y = (samples[0] + samples[1] + samples[2] + samples[3] + samples[4]) / 5.0;\n"
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"\n"
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"i[0] = (samples[1] - y) * sin(angles[1]);\n"
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"i[1] = (samples[5] - y) * sin(angles[5]);\n"
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"i[2] = (samples[2] - y) * sin(angles[2]);\n"
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"i[3] = (samples[6] - y) * sin(angles[6]);\n"
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"i[4] = (samples[3] - y) * sin(angles[3]);\n"
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"float iSum = (i[0] + i[1] + i[2] + i[3] + i[4]) * 1.1914;\n"
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"\n"
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"q[0] = (samples[1] - y) * cos(angles[1]);\n"
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"q[1] = (samples[5] - y) * cos(angles[5]);\n"
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"q[2] = (samples[2] - y) * cos(angles[2]);\n"
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"q[3] = (samples[6] - y) * cos(angles[6]);\n"
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"q[4] = (samples[3] - y) * cos(angles[3]);\n"
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"float qSum = (q[0] + q[1] + q[2] + q[3] + q[4]) * 1.0452;\n"
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"\n"
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"\n"
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"fragColour = vec4( y + 0.965 * iSum + 0.621 * qSum, "
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"y - 0.272 * iSum - 0.647 * qSum, "
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"y - 1.106 * iSum + 1.703 * qSum, "
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"1.0);\n"
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"}\n";
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#if defined(DEBUG)
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