Antonis Ryakiotakis
4097f9c3c4
ATIs. This is actually a test to see if this can be enabled on ATI cards. According to various sources, newer ATI cards supporting GLSL 3.0 support gl_ClippingDistance in shaders, which is the forward compatible way to do custom clipping. This fix will bind 6 additional varying variables on ATIs, which may lead to some shaders not compiling due to limiting out of those variables, or to performance degradation. Also I do not have an ATI handy to test. Having those in mind, this commit may well be reverted later. Clipping planes are usually 4 (6 is for cube clipping), but making shaders depend on viewport state is really bad, and would lead to recompilation, so I took the worst case here to avoid that. Hopefully driver does some optimization there.
55 lines
1.1 KiB
GLSL
55 lines
1.1 KiB
GLSL
|
|
#if defined(USE_SOLID_LIGHTING) || defined(USE_SCENE_LIGHTING)
|
|
varying vec3 varying_normal;
|
|
|
|
#ifndef USE_SOLID_LIGHTING
|
|
varying vec3 varying_position;
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef USE_COLOR
|
|
varying vec4 varying_vertex_color;
|
|
#endif
|
|
|
|
#ifdef USE_TEXTURE
|
|
varying vec2 varying_texture_coord;
|
|
#endif
|
|
|
|
#ifdef CLIP_WORKAROUND
|
|
varying float gl_ClipDistance[6];
|
|
#endif
|
|
|
|
void main()
|
|
{
|
|
vec4 co = gl_ModelViewMatrix * gl_Vertex;
|
|
|
|
#if defined(USE_SOLID_LIGHTING) || defined(USE_SCENE_LIGHTING)
|
|
varying_normal = normalize(gl_NormalMatrix * gl_Normal);
|
|
|
|
#ifndef USE_SOLID_LIGHTING
|
|
varying_position = co.xyz;
|
|
#endif
|
|
#endif
|
|
|
|
gl_Position = gl_ProjectionMatrix * co;
|
|
|
|
#ifdef CLIP_WORKAROUND
|
|
int i;
|
|
for(i = 0; i < 6; i++)
|
|
gl_ClipDistance[i] = dot(co, gl_ClipPlane[i]);
|
|
#else
|
|
// Setting gl_ClipVertex is necessary to get glClipPlane working on NVIDIA
|
|
// graphic cards, while on ATI it can cause a software fallback.
|
|
gl_ClipVertex = co;
|
|
#endif
|
|
|
|
#ifdef USE_COLOR
|
|
varying_vertex_color = gl_Color;
|
|
#endif
|
|
|
|
#ifdef USE_TEXTURE
|
|
varying_texture_coord = (gl_TextureMatrix[0] * gl_MultiTexCoord0).st;
|
|
#endif
|
|
}
|
|
|