109 lines
3.3 KiB
GLSL
109 lines
3.3 KiB
GLSL
#define PASS_POST_UNDEFINED 0
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#define PASS_POST_ACCUMULATED_COLOR 1
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#define PASS_POST_ACCUMULATED_LIGHT 2
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#define PASS_POST_ACCUMULATED_VALUE 3
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#define PASS_POST_DEPTH 4
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#define PASS_POST_AO 5
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#define PASS_POST_NORMAL 6
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#define PASS_POST_TWO_LIGHT_BUFFERS 7
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uniform int postProcessType;
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uniform int currentSample;
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uniform sampler2D inputBuffer;
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uniform sampler2D inputSecondLightBuffer;
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uniform sampler2D inputColorBuffer;
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out vec4 fragColor;
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vec3 safe_divide_even_color(vec3 a, vec3 b)
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{
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vec3 result = vec3((b.r != 0.0) ? a.r / b.r : 0.0,
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(b.g != 0.0) ? a.g / b.g : 0.0,
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(b.b != 0.0) ? a.b / b.b : 0.0);
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/* try to get gray even if b is zero */
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if (b.r == 0.0) {
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if (b.g == 0.0) {
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result = result.bbb;
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}
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else if (b.b == 0.0) {
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result = result.ggg;
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}
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else {
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result.r = 0.5 * (result.g + result.b);
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}
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}
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else if (b.g == 0.0) {
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if (b.b == 0.0) {
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result = result.rrr;
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}
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else {
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result.g = 0.5 * (result.r + result.b);
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}
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}
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else if (b.b == 0.0) {
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result.b = 0.5 * (result.r + result.g);
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}
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return result;
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}
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void main()
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{
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vec3 color;
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ivec2 texel = ivec2(gl_FragCoord.xy);
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if (postProcessType == PASS_POST_DEPTH) {
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float depth = texelFetch(depthBuffer, texel, 0).r;
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if (depth == 1.0f) {
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depth = 1e10;
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}
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else {
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depth = -get_view_z_from_depth(depth);
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}
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color = vec3(depth);
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}
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else if (postProcessType == PASS_POST_AO) {
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float ao_accum = texelFetch(inputBuffer, texel, 0).r;
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color = vec3(min(1.0, ao_accum / currentSample));
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}
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else if (postProcessType == PASS_POST_NORMAL) {
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float depth = texelFetch(depthBuffer, texel, 0).r;
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vec2 encoded_normal = texelFetch(inputBuffer, texel, 0).rg;
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/* decode the normals only when they are valid. otherwise the result buffer will be filled
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* with NaN's */
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if (depth != 1.0 && any(notEqual(encoded_normal, vec2(0.0)))) {
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vec3 decoded_normal = normal_decode(texelFetch(inputBuffer, texel, 0).rg, vec3(0.0));
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vec3 world_normal = mat3(ViewMatrixInverse) * decoded_normal;
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color = world_normal;
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}
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else {
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color = vec3(0.0);
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}
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}
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else if (postProcessType == PASS_POST_ACCUMULATED_VALUE) {
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float accumulated_value = texelFetch(inputBuffer, texel, 0).r;
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color = vec3(accumulated_value / currentSample);
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}
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else if (postProcessType == PASS_POST_ACCUMULATED_COLOR) {
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vec3 accumulated_color = texelFetch(inputBuffer, texel, 0).rgb;
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color = (accumulated_color / currentSample);
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}
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else if (postProcessType == PASS_POST_ACCUMULATED_LIGHT) {
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vec3 accumulated_light = texelFetch(inputBuffer, texel, 0).rgb;
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vec3 accumulated_color = texelFetch(inputColorBuffer, texel, 0).rgb;
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color = safe_divide_even_color(accumulated_light, accumulated_color);
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}
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else if (postProcessType == PASS_POST_TWO_LIGHT_BUFFERS) {
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vec3 accumulated_light = texelFetch(inputBuffer, texel, 0).rgb +
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texelFetch(inputSecondLightBuffer, texel, 0).rgb;
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vec3 accumulated_color = texelFetch(inputColorBuffer, texel, 0).rgb;
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color = safe_divide_even_color(accumulated_light, accumulated_color);
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}
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else {
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/* Output error color: Unknown how to post process this pass. */
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color = vec3(1.0, 0.0, 1.0);
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}
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fragColor = vec4(color, 1.0);
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}
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