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#version 420 compatibility
#extension GL_ARB_uniform_buffer_object : enable
//#extension GL_EXT_gpu_shader4 : enable
//#define MAX_DECALS_PER_GROUP 48
//#define MAX_DECALS_GROUPS 300
struct SDecalGroup {
vec4 boundAABB[2];
int ids[MAX_DECALS_PER_GROUP];
};
//FIXME layout(std140)
layout(packed) uniform decalGroupsUBO
{
SDecalGroup groups[MAX_DECALS_GROUPS];
};
layout(location = 0) in vec3 vertexPos;
uniform vec3 camPos;
uniform mat4 viewProjMatrix;
flat out int decalGroupId;
void main() {
decalGroupId = gl_InstanceID;
SDecalGroup g = groups[gl_InstanceID];
vec3 clampedPos = mix(g.boundAABB[0].xyz, g.boundAABB[1].xyz, step(vec3(0.0), vertexPos) );
gl_Position = viewProjMatrix * vec4(clampedPos, 1.0);
}
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