diff options
Diffstat (limited to 'sys/glsink/regcomb_yuvrgb.c')
| -rw-r--r-- | sys/glsink/regcomb_yuvrgb.c | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/sys/glsink/regcomb_yuvrgb.c b/sys/glsink/regcomb_yuvrgb.c index 54727d1e..151b8e18 100644 --- a/sys/glsink/regcomb_yuvrgb.c +++ b/sys/glsink/regcomb_yuvrgb.c @@ -29,22 +29,23 @@ unsigned int UVwidth = 256, UVheight = 512; int tex_xsize, tex_ysize; void -GenerateRGBTables (unsigned char *Ytable, // Y-palette - unsigned char *Utable, // U-palette - unsigned char *Vtable, // V-palette - float *bias, // bias (fourth vector to be added) - float *Uscale, // scaling color for U - float *Vscale) // scaling color for V +GenerateRGBTables (unsigned char *Ytable, // Y-palette + unsigned char *Utable, // U-palette + unsigned char *Vtable, // V-palette + float *bias, // bias (fourth vector to be added) + float *Uscale, // scaling color for U + float *Vscale) // scaling color for V { int i; - const float mat[9] = { // the modified YUV->RGB matrix + const float mat[9] = { // the modified YUV->RGB matrix +1.130469478f, -0.058755723f, +1.596026304f, +1.130469478f, -0.450515935f, -0.812967512f, +1.130469478f, +1.958477882f, 0.0f }; -#define COMPRESS(a)(0.5f*(a)+128.0f) // counter-piece to EXPAND_NORMAL + +#define COMPRESS(a)(0.5f*(a)+128.0f) // counter-piece to EXPAND_NORMAL #define fCOMPRESS(a) (0.5f*(a)+0.5f); -#define XCLAMP(a) ((a)<0.0f ? 0.0f : ((a)>255.0f ? 255.0f : (a))) // should not be necessary, but what do you know. +#define XCLAMP(a) ((a)<0.0f ? 0.0f : ((a)>255.0f ? 255.0f : (a))) // should not be necessary, but what do you know. bias[0] = fCOMPRESS (-0.842580964f); bias[1] = fCOMPRESS (+0.563287723f); bias[2] = fCOMPRESS (-1.0f); @@ -59,17 +60,17 @@ GenerateRGBTables (unsigned char *Ytable, // Y-palette Vscale[3] = 0.0f; for (i = 0; i < 256; i++) { // Y-table holds unsigned values - Ytable[3 * i] = (unsigned char) XCLAMP (mat[0] * (float) i); // R - Ytable[3 * i + 1] = (unsigned char) XCLAMP (mat[3] * (float) i); // G - Ytable[3 * i + 2] = (unsigned char) XCLAMP (mat[6] * (float) i); // B + Ytable[3 * i] = (unsigned char) XCLAMP (mat[0] * (float) i); // R + Ytable[3 * i + 1] = (unsigned char) XCLAMP (mat[3] * (float) i); // G + Ytable[3 * i + 2] = (unsigned char) XCLAMP (mat[6] * (float) i); // B // U-table holds signed values - Utable[3 * i] = (unsigned char) XCLAMP (COMPRESS (255.0f / 16.0f * mat[1] * (float) i)); // R - Utable[3 * i + 1] = (unsigned char) XCLAMP (COMPRESS (255.0f / 120.0f * mat[4] * (float) i)); // G - Utable[3 * i + 2] = (unsigned char) XCLAMP (COMPRESS (255.0f / 500.0f * mat[7] * (float) i)); // B + Utable[3 * i] = (unsigned char) XCLAMP (COMPRESS (255.0f / 16.0f * mat[1] * (float) i)); // R + Utable[3 * i + 1] = (unsigned char) XCLAMP (COMPRESS (255.0f / 120.0f * mat[4] * (float) i)); // G + Utable[3 * i + 2] = (unsigned char) XCLAMP (COMPRESS (255.0f / 500.0f * mat[7] * (float) i)); // B // V-table holds signed values - Vtable[3 * i] = (unsigned char) XCLAMP (COMPRESS (255.0f / 408.0f * mat[2] * (float) i)); // R - Vtable[3 * i + 1] = (unsigned char) XCLAMP (COMPRESS (255.0f / 210.0f * mat[5] * (float) i)); // G - Vtable[3 * i + 2] = (unsigned char) (128.0f - 14.0f); // G constant + Vtable[3 * i] = (unsigned char) XCLAMP (COMPRESS (255.0f / 408.0f * mat[2] * (float) i)); // R + Vtable[3 * i + 1] = (unsigned char) XCLAMP (COMPRESS (255.0f / 210.0f * mat[5] * (float) i)); // G + Vtable[3 * i + 2] = (unsigned char) (128.0f - 14.0f); // G constant } #undef fCOMPRESS #undef COMPRESS @@ -315,7 +316,7 @@ PowerOfTwo (unsigned int i) // Initializes textures. Call once prior to rendering void -InitYUVPlanes (GLuint * Yhandle, GLuint * Uhandle, GLuint * Vhandle, unsigned int Ywidth, unsigned int Yheight, unsigned int UVwidth, unsigned int UVheight, GLenum filter, // filter should be either GL_NEAREST or GL_LINEAR. Test this! +InitYUVPlanes (GLuint * Yhandle, GLuint * Uhandle, GLuint * Vhandle, unsigned int Ywidth, unsigned int Yheight, unsigned int UVwidth, unsigned int UVheight, GLenum filter, // filter should be either GL_NEAREST or GL_LINEAR. Test this! unsigned char *Ypal, unsigned char *Upal, unsigned char *Vpal) { glGenTextures (1, Yhandle); |