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#version 330
//
// Picks a point from the depth buffer and returns the world position
//
#if defined VERTEX_SHADER
uniform sampler2D position_texture;
uniform sampler2D normal_texture;
uniform sampler2D diffuse_texture;
uniform mat4 modelview;
uniform ivec2 texel_pos;
out vec3 out_position;
out vec3 out_normal;
out float out_temperature;
void main() {
vec3 viewpos = texelFetch(position_texture, texel_pos, 0).rgb;
if (viewpos.z == 0.0) {
// A 0.0 z value means we missed the mesh. Just write out 0.0 as the result
out_position = vec3(0.0);
out_normal = vec3(0.0);
out_temperature = 0.0;
} else {
// Reverse translations and rotations aligning the point with the original mesh
out_position = (inverse(modelview) * vec4(viewpos, 1.0)).xyz;
out_normal = texelFetch(normal_texture, texel_pos, 0).xyz;
out_temperature = texelFetch(diffuse_texture, texel_pos, 0).r;
}
}
#endif
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