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Some more documentation

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19226 b3059339-0415-0410-9bf9-f77b7e298cf2
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reimar 2006-07-28 19:37:49 +00:00
parent cb1dbb73a7
commit b0b702f667
1 changed files with 57 additions and 0 deletions
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57
libvo/gl_common.c
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@ -629,6 +629,14 @@ static void glSetupYUVCombinersATI(float uvcos, float uvsin) {
EndFragmentShader();
}
/**
* \brief helper function for gen_spline_lookup_tex
* \param x subpixel-position ((0,1) range) to calculate weights for
* \param dst where to store transformed weights, must provide space for 4 GLfloats
*
* calculates the weights and stores them after appropriate transformation
* for the scaler fragment program.
*/
static void store_weights(float x, GLfloat *dst) {
float w0 = (((-1 * x + 3) * x - 3) * x + 1) / 6;
float w1 = ((( 3 * x - 6) * x + 0) * x + 4) / 6;
@ -745,6 +753,12 @@ static const char *yuv_lookup3d_prog_template =
"TEX result.color, yuv, texture[%c], 3D;"
"END";
/**
* \brief creates and initializes helper textures needed for scaling texture read
* \param scaler scaler type to create texture for
* \param texu contains next free texture unit number
* \param texs texture unit ids for the scaler are stored in this array
*/
static void create_scaler_textures(int scaler, int *texu, char *texs) {
switch (scaler) {
case YUV_SCALER_BILIN:
@ -784,7 +798,20 @@ static void get_yuv2rgb_coeffs(float brightness, float contrast, float uvcos, fl
*bc += 0.5 - contrast / 2.0;
}
//! size of gamma map use to avoid slow exp function in gen_yuv2rgb_map
#define GMAP_SIZE (1024)
/**
* \brief generate a 3D YUV -> RGB map
* \param map where to store map. Must provide space for (size + 2)^3 elements
* \param size size of the map, excluding border
* \param brightness desired brightness adjustment for conversion
* \param contrast desired contrast adjustment for conversion
* \param uvcos desired hue/saturation adjustment for conversion
* \param uvsin desired hue/saturation adjustment for conversion
* \param rgamma desired red gamma adjustment for conversion
* \param ggamma desired green gamma adjustment for conversion
* \param bgamma desired blue gamma adjustment for conversion
*/
static void gen_yuv2rgb_map(unsigned char *map, int size, float brightness,
float contrast, float uvcos, float uvsin,
float rgamma, float ggamma, float bgamma) {
@ -834,6 +861,18 @@ static void gen_yuv2rgb_map(unsigned char *map, int size, float brightness,
#define LOOKUP_RES 512
//! resolution for 3D yuv->rgb conversion lookup table
#define LOOKUP_3DRES 32
/**
* \brief creates and initializes helper textures needed for yuv conversion
* \param texu contains next free texture unit number
* \param texs texture unit ids for the conversion are stored in this array
* \param brightness desired brightness adjustment for conversion
* \param contrast desired contrast adjustment for conversion
* \param uvcos desired hue/saturation adjustment for conversion
* \param uvsin desired hue/saturation adjustment for conversion
* \param rgamma desired red gamma adjustment for conversion
* \param ggamma desired green gamma adjustment for conversion
* \param bgamma desired blue gamma adjustment for conversion
*/
static void create_conv_textures(int conv, int *texu, char *texs,
float brightness, float contrast, float uvcos, float uvsin,
float rgamma, float ggamma, float bgamma) {
@ -889,6 +928,18 @@ static void create_conv_textures(int conv, int *texu, char *texs,
free(lookup_data);
}
/**
* \brief adds a scaling texture read at the current fragment program position
* \param scaler type of scaler to insert
* \param prog_pos current position in fragment program
* \param remain how many bytes remain in the buffer given by prog_pos
* \param texs array containing the texture unit identifiers for this scaler
* \param in_tex texture unit the scaler should read from
* \param out_comp component of the yuv variable the scaler stores the result in
* \param rect if rectangular (pixel) adressing should be used for in_tex
* \param texw width of the in_tex texture
* \param texh height of the in_tex texture
*/
static void add_scaler(int scaler, char **prog_pos, int *remain, char *texs,
char in_tex, char out_comp, int rect, int texw, int texh) {
switch (scaler) {
@ -935,6 +986,12 @@ static const struct {
{NULL, 0, 0}
};
/**
* \brief load the specified GPU Program
* \param target program target to load into, only GL_FRAGMENT_PROGRAM is tested
* \param prog program string
* \return 1 on success, 0 otherwise
*/
int loadGPUProgram(GLenum target, char *prog) {
int i;
GLint cur = 0, max = 0, err = 0;