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Started sketching out shaders to do the first part of the composite conversion.

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This commit is contained in:
Thomas Harte 2016-03-07 19:21:04 -05:00
parent cd9c62acca
commit 2de229152f
1 changed files with 77 additions and 14 deletions
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91
Outputs/CRT/CRTOpenGL.cpp
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@ -245,24 +245,67 @@ void CRT::set_rgb_sampling_function(const char *shader)
_rgb_shader = strdup(shader);
}
#pragma mark - Input vertex shader (i.e. from source data to intermediate line layout)
char *CRT::get_input_vertex_shader()
{
return strdup(
"#version 150\n"
"in vec2 inputPosition;"
"in vec2 outputPosition;"
"in vec2 phaseAndAmplitude;"
"in float phaseTime;"
"uniform vec2 textureSize;"
"uniform float phaseCyclesPerTick;"
"out vec2 inputPositionVerying;"
"out float phaseVarying;"
"void main(void)"
"{"
"inputPositionVerying = inputPosition;"
"gl_Position = vec4(outputPosition.x * 2.0 / textureSize.width - 1.0, outputPosition.y * 2.0 / textureSize.height - 1.0, 0.0, 1.0);"
"phaseVarying = (phaseCyclesPerTick * phaseTime + phaseAndAmplitude.x) * 2.0 * 3.141592654;"
"}");
}
char *CRT::get_input_fragment_shader()
{
const char *composite_shader = _composite_shader;
if(!composite_shader)
{
}
return get_compound_shader(
"#version 150\n"
"in vec2 inputPositionVerying;"
"in float phaseVarying;"
"out vec4 fragColour;"
"uniform sampler2D texID;"
"\n%s\n"
"void main(void)"
"{"
"fragColour = vec4(composite_sample(inputPositionVarying, phaseVarying), 0.0, 0.0, 1.0);"
"}"
, composite_shader);
}
#pragma mark - Intermediate vertex shaders (i.e. from intermediate line layout to intermediate line layout)
#pragma mark - Output vertex shader
char *CRT::get_output_vertex_shader()
{
// the main job of the vertex shader is just to map from an input area of [0,1]x[0,1], with the origin in the
// top left to OpenGL's [-1,1]x[-1,1] with the origin in the lower left, and to convert input data coordinates
// from integral to floating point; there's also some setup for NTSC, PAL or whatever.
// const char *const ntscVertexShaderGlobals =
// "out vec2 srcCoordinatesVarying[4];\n"
// "out float phase;\n";
//
// const char *const ntscVertexShaderBody =
// "phase = srcCoordinates.x * 6.283185308;\n"
// "\n"
// "srcCoordinatesVarying[0] = vec2(srcCoordinates.x / textureSize.x, (srcCoordinates.y + 0.5) / textureSize.y);\n"
// "srcCoordinatesVarying[3] = srcCoordinatesVarying[0] + vec2(0.375 / textureSize.x, 0.0);\n"
// "srcCoordinatesVarying[2] = srcCoordinatesVarying[0] + vec2(0.125 / textureSize.x, 0.0);\n"
// "srcCoordinatesVarying[1] = srcCoordinatesVarying[0] - vec2(0.125 / textureSize.x, 0.0);\n"
// "srcCoordinatesVarying[0] = srcCoordinatesVarying[0] - vec2(0.325 / textureSize.x, 0.0);\n";
// from integral to floating point.
return strdup(
"#version 150\n"
@ -305,6 +348,8 @@ char *CRT::get_output_vertex_shader()
"}");
}
#pragma mark - Output fragment shaders; RGB and from composite
char *CRT::get_rgb_output_fragment_shader()
{
return get_output_fragment_shader(_rgb_shader);
@ -343,6 +388,20 @@ char *CRT::get_output_fragment_shader(const char *sampling_function)
, sampling_function);
}
// const char *const ntscVertexShaderGlobals =
// "out vec2 srcCoordinatesVarying[4];\n"
// "out float phase;\n";
//
// const char *const ntscVertexShaderBody =
// "phase = srcCoordinates.x * 6.283185308;\n"
// "\n"
// "srcCoordinatesVarying[0] = vec2(srcCoordinates.x / textureSize.x, (srcCoordinates.y + 0.5) / textureSize.y);\n"
// "srcCoordinatesVarying[3] = srcCoordinatesVarying[0] + vec2(0.375 / textureSize.x, 0.0);\n"
// "srcCoordinatesVarying[2] = srcCoordinatesVarying[0] + vec2(0.125 / textureSize.x, 0.0);\n"
// "srcCoordinatesVarying[1] = srcCoordinatesVarying[0] - vec2(0.125 / textureSize.x, 0.0);\n"
// "srcCoordinatesVarying[0] = srcCoordinatesVarying[0] - vec2(0.325 / textureSize.x, 0.0);\n";
// assumes y = [0, 1], i and q = [-0.5, 0.5]; therefore i components are multiplied by 1.1914 versus standard matrices, q by 1.0452
// const char *const yiqToRGB = "const mat3 yiqToRGB = mat3(1.0, 1.0, 1.0, 1.1389784, -0.3240608, -1.3176884, 0.6490692, -0.6762444, 1.7799756);";
@ -376,6 +435,8 @@ char *CRT::get_output_fragment_shader(const char *sampling_function)
// dot(vec3(1.0/6.0, 2.0/3.0, 1.0/6.0), vec3(sample(srcCoordinatesVarying[0]), sample(srcCoordinatesVarying[0]), sample(srcCoordinatesVarying[0])));//sin(lateralVarying));\n";
//}
#pragma mark - Shader utilities
char *CRT::get_compound_shader(const char *base, const char *insert)
{
size_t totalLength = strlen(base) + strlen(insert) + 1;
@ -384,6 +445,8 @@ char *CRT::get_compound_shader(const char *base, const char *insert)
return text;
}
#pragma mark - Program compilation
void CRT::prepare_rgb_output_shader()
{
char *vertex_shader = get_output_vertex_shader();