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static string OpenGLOutputVertexShader = R"(
#version 150
uniform vec4 targetSize;
uniform vec4 outputSize;
in vec2 texCoord;
out Vertex {
vec2 texCoord;
} vertexOut;
void main() {
//center image within output window
if(gl_VertexID == 0 || gl_VertexID == 2) {
gl_Position.x = -(targetSize.x / outputSize.x);
} else {
gl_Position.x = +(targetSize.x / outputSize.x);
}
//center and flip vertically (buffer[0, 0] = top-left; OpenGL[0, 0] = bottom-left)
if(gl_VertexID == 0 || gl_VertexID == 1) {
gl_Position.y = +(targetSize.y / outputSize.y);
} else {
gl_Position.y = -(targetSize.y / outputSize.y);
}
//align image to even pixel boundary to prevent aliasing
vec2 align = fract((outputSize.xy + targetSize.xy) / 2.0) * 2.0;
gl_Position.xy -= align / outputSize.xy;
gl_Position.zw = vec2(0.0, 1.0);
vertexOut.texCoord = texCoord;
}
)";
static string OpenGLVertexShader = R"(
#version 150
in vec4 position;
in vec2 texCoord;
out Vertex {
vec2 texCoord;
} vertexOut;
void main() {
gl_Position = position;
vertexOut.texCoord = texCoord;
}
)";
static string OpenGLGeometryShader = R"(
#version 150
layout(triangles) in;
layout(triangle_strip, max_vertices = 3) out;
in Vertex {
vec2 texCoord;
} vertexIn[];
out Vertex {
vec2 texCoord;
};
void main() {
for(int i = 0; i < gl_in.length(); i++) {
gl_Position = gl_in[i].gl_Position;
texCoord = vertexIn[i].texCoord;
EmitVertex();
}
EndPrimitive();
}
)";
static string OpenGLFragmentShader = R"(
#version 150
uniform sampler2D source[];
in Vertex {
vec2 texCoord;
};
out vec4 fragColor;
void main() {
fragColor = texture(source[0], texCoord);
}
)";
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