eac4c984df
This commit adds a new rendering backend, GLES2, and adds a project setting to enable it. Currently this backend can only be used on the X11 platform, but integrating into other platforms is planned.
80 lines
1.8 KiB
GLSL
80 lines
1.8 KiB
GLSL
[vertex]
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layout(location=0) in highp vec4 vertex_attrib;
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layout(location=4) in vec2 uv_in;
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out vec2 uv_interp;
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void main() {
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uv_interp = uv_in;
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gl_Position = vertex_attrib;
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}
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[fragment]
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uniform highp samplerCube source_cube; //texunit:0
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in vec2 uv_interp;
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uniform bool z_flip;
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uniform highp float z_far;
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uniform highp float z_near;
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uniform highp float bias;
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void main() {
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highp vec3 normal = vec3( uv_interp * 2.0 - 1.0, 0.0 );
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/*
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if(z_flip) {
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normal.z = 0.5 - 0.5*((normal.x * normal.x) + (normal.y * normal.y));
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} else {
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normal.z = -0.5 + 0.5*((normal.x * normal.x) + (normal.y * normal.y));
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}
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*/
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//normal.z = sqrt(1.0-dot(normal.xy,normal.xy));
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//normal.xy*=1.0+normal.z;
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normal.z = 0.5 - 0.5*((normal.x * normal.x) + (normal.y * normal.y));
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normal = normalize(normal);
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/*
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normal.z=0.5;
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normal=normalize(normal);
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*/
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if (!z_flip) {
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normal.z=-normal.z;
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}
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//normal = normalize(vec3( uv_interp * 2.0 - 1.0, 1.0 ));
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float depth = texture(source_cube,normal).r;
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// absolute values for direction cosines, bigger value equals closer to basis axis
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vec3 unorm = abs(normal);
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if ( (unorm.x >= unorm.y) && (unorm.x >= unorm.z) ) {
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// x code
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unorm = normal.x > 0.0 ? vec3( 1.0, 0.0, 0.0 ) : vec3( -1.0, 0.0, 0.0 ) ;
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} else if ( (unorm.y > unorm.x) && (unorm.y >= unorm.z) ) {
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// y code
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unorm = normal.y > 0.0 ? vec3( 0.0, 1.0, 0.0 ) : vec3( 0.0, -1.0, 0.0 ) ;
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} else if ( (unorm.z > unorm.x) && (unorm.z > unorm.y) ) {
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// z code
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unorm = normal.z > 0.0 ? vec3( 0.0, 0.0, 1.0 ) : vec3( 0.0, 0.0, -1.0 ) ;
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} else {
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// oh-no we messed up code
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// has to be
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unorm = vec3( 1.0, 0.0, 0.0 );
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}
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float depth_fix = 1.0 / dot(normal,unorm);
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depth = 2.0 * depth - 1.0;
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float linear_depth = 2.0 * z_near * z_far / (z_far + z_near - depth * (z_far - z_near));
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gl_FragDepth = (linear_depth*depth_fix+bias) / z_far;
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}
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