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Add ZLUT initialization.

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This commit is contained in:
Sergey Lipskiy 2013-10-30 14:39:37 +07:00
parent 4660e272a0
commit cd81074c9e
1 changed files with 36 additions and 0 deletions
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36
GLSLCombiner.cpp
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@ -19,6 +19,7 @@ static GLhandleARB g_calc_light_shader_object;
static GLhandleARB g_calc_lod_shader_object;
static GLhandleARB g_calc_noise_shader_object;
static GLhandleARB g_calc_depth_shader_object;
static GLuint g_zlut_tex = 0;
static
void display_warning(const char *text, ...)
@ -303,6 +304,38 @@ static const char* depth_compare_shader =
"} \n"
;
void InitZlutTexture()
{
u16 * zLUT = new u16[0x40000];
for(int i=0; i<0x40000; i++) {
u32 exponent = 0;
u32 testbit = 1 << 17;
while((i & testbit) && (exponent < 7)) {
exponent++;
testbit = 1 << (17 - exponent);
}
u32 mantissa = (i >> (6 - (6 < exponent ? 6 : exponent))) & 0x7ff;
zLUT[i] = (u16)(((exponent << 11) | mantissa) << 2);
}
glGenTextures(1, &g_zlut_tex);
glBindTexture(GL_TEXTURE_2D, g_zlut_tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED,
512, 512, 0, GL_RED, GL_UNSIGNED_SHORT,
zLUT);
delete[] zLUT;
}
void DestroyZlutTexture()
{
if (g_zlut_tex > 0)
glDeleteTextures(1, &g_zlut_tex);
}
void InitGLSLCombiner()
{
glActiveTextureARB(GL_TEXTURE0_ARB);
@ -329,10 +362,13 @@ void InitGLSLCombiner()
g_calc_depth_shader_object = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
glShaderSourceARB(g_calc_depth_shader_object, 1, &depth_compare_shader, NULL);
glCompileShaderARB(g_calc_depth_shader_object);
InitZlutTexture();
}
void DestroyGLSLCombiner() {
ogl_glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
DestroyZlutTexture();
}
static