diff options
Diffstat (limited to 'src/mesa/swrast/s_texture.c')
| -rw-r--r-- | src/mesa/swrast/s_texture.c | 444 |
1 files changed, 236 insertions, 208 deletions
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c index 213971667ad..c4ac9679ecf 100644 --- a/src/mesa/swrast/s_texture.c +++ b/src/mesa/swrast/s_texture.c @@ -1,8 +1,8 @@ /* * Mesa 3-D graphics library - * Version: 6.1 + * Version: 6.3 * - * Copyright (C) 1999-2004 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2005 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -36,15 +36,94 @@ #include "s_texture.h" -/* - * These values are used in the fixed-point arithmetic used - * for linear filtering. +/** + * Constants for integer linear interpolation. */ -#define WEIGHT_SCALE 65536.0F -#define WEIGHT_SHIFT 16 +#define ILERP_SCALE 65536.0F +#define ILERP_SHIFT 16 -/* +/** + * Linear interpolation macros + */ +#define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) ) +#define ILERP(IT, A, B) ( (A) + (((IT) * ((B) - (A))) >> ILERP_SHIFT) ) + + +/** + * Do 2D/biliner interpolation of float values. + * v00, v10, v01 and v11 are typically four texture samples in a square/box. + * a and b are the horizontal and vertical interpolants. + * It's important that this function is inlined when compiled with + * optimization! If we find that's not true on some systems, convert + * to a macro. + */ +static INLINE GLfloat +lerp_2d(GLfloat a, GLfloat b, + GLfloat v00, GLfloat v10, GLfloat v01, GLfloat v11) +{ + const GLfloat temp0 = LERP(a, v00, v10); + const GLfloat temp1 = LERP(a, v01, v11); + return LERP(b, temp0, temp1); +} + + +/** + * Do 2D/biliner interpolation of integer values. + * \sa lerp_2d + */ +static INLINE GLint +ilerp_2d(GLint ia, GLint ib, + GLint v00, GLint v10, GLint v01, GLint v11) +{ + /* fixed point interpolants in [0, ILERP_SCALE] */ + const GLint temp0 = ILERP(ia, v00, v10); + const GLint temp1 = ILERP(ia, v01, v11); + return ILERP(ib, temp0, temp1); +} + + +/** + * Do 3D/trilinear interpolation of float values. + * \sa lerp_2d + */ +static INLINE GLfloat +lerp_3d(GLfloat a, GLfloat b, GLfloat c, + GLfloat v000, GLfloat v100, GLfloat v010, GLfloat v110, + GLfloat v001, GLfloat v101, GLfloat v011, GLfloat v111) +{ + const GLfloat temp00 = LERP(a, v000, v100); + const GLfloat temp10 = LERP(a, v010, v110); + const GLfloat temp01 = LERP(a, v001, v101); + const GLfloat temp11 = LERP(a, v011, v111); + const GLfloat temp0 = LERP(b, temp00, temp10); + const GLfloat temp1 = LERP(b, temp01, temp11); + return LERP(c, temp0, temp1); +} + + +/** + * Do 3D/trilinear interpolation of integer values. + * \sa lerp_2d + */ +static INLINE GLint +ilerp_3d(GLint ia, GLint ib, GLint ic, + GLint v000, GLint v100, GLint v010, GLint v110, + GLint v001, GLint v101, GLint v011, GLint v111) +{ + /* fixed point interpolants in [0, ILERP_SCALE] */ + const GLint temp00 = ILERP(ia, v000, v100); + const GLint temp10 = ILERP(ia, v010, v110); + const GLint temp01 = ILERP(ia, v001, v101); + const GLint temp11 = ILERP(ia, v011, v111); + const GLint temp0 = ILERP(ib, temp00, temp10); + const GLint temp1 = ILERP(ib, temp01, temp11); + return ILERP(ic, temp0, temp1); +} + + + +/** * Compute the remainder of a divided by b, but be careful with * negative values so that GL_REPEAT mode works right. */ @@ -58,7 +137,7 @@ repeat_remainder(GLint a, GLint b) } -/* +/** * Used to compute texel locations for linear sampling. * Input: * wrapMode = GL_REPEAT, GL_CLAMP, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_BORDER @@ -176,7 +255,7 @@ repeat_remainder(GLint a, GLint b) } -/* +/** * Used to compute texel location for nearest sampling. */ #define COMPUTE_NEAREST_TEXEL_LOCATION(wrapMode, S, SIZE, I) \ @@ -503,17 +582,9 @@ sample_1d_linear(GLcontext *ctx, { const GLfloat a = FRAC(u); - -#if CHAN_TYPE == GL_FLOAT || CHAN_TYPE == GL_UNSIGNED_SHORT - const GLfloat w0 = (1.0F-a); - const GLfloat w1 = a ; -#else /* CHAN_BITS == 8 */ - /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */ - const GLint w0 = IROUND_POS((1.0F - a) * WEIGHT_SCALE); - const GLint w1 = IROUND_POS( a * WEIGHT_SCALE); -#endif GLchan t0[4], t1[4]; /* texels */ + /* fetch texel colors */ if (useBorderColor & I0BIT) { COPY_CHAN4(t0, tObj->_BorderChan); } @@ -527,23 +598,28 @@ sample_1d_linear(GLcontext *ctx, img->FetchTexelc(img, i1, 0, 0, t1); } + /* do linear interpolation of texel colors */ #if CHAN_TYPE == GL_FLOAT - rgba[0] = w0 * t0[0] + w1 * t1[0]; - rgba[1] = w0 * t0[1] + w1 * t1[1]; - rgba[2] = w0 * t0[2] + w1 * t1[2]; - rgba[3] = w0 * t0[3] + w1 * t1[3]; + rgba[0] = LERP(a, t0[0], t1[0]); + rgba[1] = LERP(a, t0[1], t1[1]); + rgba[2] = LERP(a, t0[2], t1[2]); + rgba[3] = LERP(a, t0[3], t1[3]); #elif CHAN_TYPE == GL_UNSIGNED_SHORT - rgba[0] = (GLchan) (w0 * t0[0] + w1 * t1[0] + 0.5); - rgba[1] = (GLchan) (w0 * t0[1] + w1 * t1[1] + 0.5); - rgba[2] = (GLchan) (w0 * t0[2] + w1 * t1[2] + 0.5); - rgba[3] = (GLchan) (w0 * t0[3] + w1 * t1[3] + 0.5); -#else /* CHAN_BITS == 8 */ - rgba[0] = (GLchan) ((w0 * t0[0] + w1 * t1[0]) >> WEIGHT_SHIFT); - rgba[1] = (GLchan) ((w0 * t0[1] + w1 * t1[1]) >> WEIGHT_SHIFT); - rgba[2] = (GLchan) ((w0 * t0[2] + w1 * t1[2]) >> WEIGHT_SHIFT); - rgba[3] = (GLchan) ((w0 * t0[3] + w1 * t1[3]) >> WEIGHT_SHIFT); + rgba[0] = (GLchan) (LERP(a, t0[0], t1[0]) + 0.5); + rgba[1] = (GLchan) (LERP(a, t0[1], t1[1]) + 0.5); + rgba[2] = (GLchan) (LERP(a, t0[2], t1[2]) + 0.5); + rgba[3] = (GLchan) (LERP(a, t0[3], t1[3]) + 0.5); +#else + ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE); + { + /* fixed point interpolants in [0, ILERP_SCALE] */ + const GLint ia = IROUND_POS(a * ILERP_SCALE); + rgba[0] = ILERP(ia, t0[0], t1[0]); + rgba[1] = ILERP(ia, t0[1], t1[1]); + rgba[2] = ILERP(ia, t0[2], t1[2]); + rgba[3] = ILERP(ia, t0[3], t1[3]); + } #endif - } } @@ -798,7 +874,7 @@ sample_2d_nearest(GLcontext *ctx, -/* +/** * Return the texture sample for coordinate (s,t) using GL_LINEAR filter. * New sampling code contributed by Lynn Quam <[email protected]>. */ @@ -836,24 +912,13 @@ sample_2d_linear(GLcontext *ctx, { const GLfloat a = FRAC(u); const GLfloat b = FRAC(v); - -#if CHAN_TYPE == GL_FLOAT || CHAN_TYPE == GL_UNSIGNED_SHORT - const GLfloat w00 = (1.0F-a) * (1.0F-b); - const GLfloat w10 = a * (1.0F-b); - const GLfloat w01 = (1.0F-a) * b ; - const GLfloat w11 = a * b ; -#else /* CHAN_BITS == 8 */ - /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */ - const GLint w00 = IROUND_POS((1.0F-a) * (1.0F-b) * WEIGHT_SCALE); - const GLint w10 = IROUND_POS( a * (1.0F-b) * WEIGHT_SCALE); - const GLint w01 = IROUND_POS((1.0F-a) * b * WEIGHT_SCALE); - const GLint w11 = IROUND_POS( a * b * WEIGHT_SCALE); +#if CHAN_TYPE == GL_UNSIGNED_BYTE + const GLint ia = IROUND_POS(a * ILERP_SCALE); + const GLint ib = IROUND_POS(b * ILERP_SCALE); #endif - GLchan t00[4]; - GLchan t10[4]; - GLchan t01[4]; - GLchan t11[4]; + GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */ + /* fetch four texel colors */ if (useBorderColor & (I0BIT | J0BIT)) { COPY_CHAN4(t00, tObj->_BorderChan); } @@ -878,39 +943,31 @@ sample_2d_linear(GLcontext *ctx, else { img->FetchTexelc(img, i1, j1, 0, t11); } + + /* do bilinear interpolation of texel colors */ #if CHAN_TYPE == GL_FLOAT - rgba[0] = w00 * t00[0] + w10 * t10[0] + w01 * t01[0] + w11 * t11[0]; - rgba[1] = w00 * t00[1] + w10 * t10[1] + w01 * t01[1] + w11 * t11[1]; - rgba[2] = w00 * t00[2] + w10 * t10[2] + w01 * t01[2] + w11 * t11[2]; - rgba[3] = w00 * t00[3] + w10 * t10[3] + w01 * t01[3] + w11 * t11[3]; + rgba[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]); + rgba[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]); + rgba[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]); + rgba[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]); #elif CHAN_TYPE == GL_UNSIGNED_SHORT - rgba[0] = (GLchan) (w00 * t00[0] + w10 * t10[0] + - w01 * t01[0] + w11 * t11[0] + 0.5); - rgba[1] = (GLchan) (w00 * t00[1] + w10 * t10[1] + - w01 * t01[1] + w11 * t11[1] + 0.5); - rgba[2] = (GLchan) (w00 * t00[2] + w10 * t10[2] + - w01 * t01[2] + w11 * t11[2] + 0.5); - rgba[3] = (GLchan) (w00 * t00[3] + w10 * t10[3] + - w01 * t01[3] + w11 * t11[3] + 0.5); -#else /* CHAN_BITS == 8 */ - rgba[0] = (GLchan) ((w00 * t00[0] + w10 * t10[0] + - w01 * t01[0] + w11 * t11[0]) >> WEIGHT_SHIFT); - rgba[1] = (GLchan) ((w00 * t00[1] + w10 * t10[1] + - w01 * t01[1] + w11 * t11[1]) >> WEIGHT_SHIFT); - rgba[2] = (GLchan) ((w00 * t00[2] + w10 * t10[2] + - w01 * t01[2] + w11 * t11[2]) >> WEIGHT_SHIFT); - rgba[3] = (GLchan) ((w00 * t00[3] + w10 * t10[3] + - w01 * t01[3] + w11 * t11[3]) >> WEIGHT_SHIFT); + rgba[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5); + rgba[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5); + rgba[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5); + rgba[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5); +#else + ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE); + rgba[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]); + rgba[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]); + rgba[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]); + rgba[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]); #endif - } - } /* - * As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT - * and we're not using a paletted texture. + * As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT. */ static INLINE void sample_2d_linear_repeat(GLcontext *ctx, @@ -938,56 +995,36 @@ sample_2d_linear_repeat(GLcontext *ctx, { const GLfloat a = FRAC(u); const GLfloat b = FRAC(v); - -#if CHAN_TYPE == GL_FLOAT || CHAN_TYPE == GL_UNSIGNED_SHORT - const GLfloat w00 = (1.0F-a) * (1.0F-b); - const GLfloat w10 = a * (1.0F-b); - const GLfloat w01 = (1.0F-a) * b ; - const GLfloat w11 = a * b ; -#else /* CHAN_BITS == 8 */ - /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */ - const GLint w00 = IROUND_POS((1.0F-a) * (1.0F-b) * WEIGHT_SCALE); - const GLint w10 = IROUND_POS( a * (1.0F-b) * WEIGHT_SCALE); - const GLint w01 = IROUND_POS((1.0F-a) * b * WEIGHT_SCALE); - const GLint w11 = IROUND_POS( a * b * WEIGHT_SCALE); +#if CHAN_TYPE == GL_UNSIGNED_BYTE + const GLint ia = IROUND_POS(a * ILERP_SCALE); + const GLint ib = IROUND_POS(b * ILERP_SCALE); #endif - GLchan t00[4]; - GLchan t10[4]; - GLchan t01[4]; - GLchan t11[4]; + GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */ img->FetchTexelc(img, i0, j0, 0, t00); img->FetchTexelc(img, i1, j0, 0, t10); img->FetchTexelc(img, i0, j1, 0, t01); img->FetchTexelc(img, i1, j1, 0, t11); + /* do bilinear interpolation of texel colors */ #if CHAN_TYPE == GL_FLOAT - rgba[0] = w00 * t00[0] + w10 * t10[0] + w01 * t01[0] + w11 * t11[0]; - rgba[1] = w00 * t00[1] + w10 * t10[1] + w01 * t01[1] + w11 * t11[1]; - rgba[2] = w00 * t00[2] + w10 * t10[2] + w01 * t01[2] + w11 * t11[2]; - rgba[3] = w00 * t00[3] + w10 * t10[3] + w01 * t01[3] + w11 * t11[3]; + rgba[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]); + rgba[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]); + rgba[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]); + rgba[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]); #elif CHAN_TYPE == GL_UNSIGNED_SHORT - rgba[0] = (GLchan) (w00 * t00[0] + w10 * t10[0] + - w01 * t01[0] + w11 * t11[0] + 0.5); - rgba[1] = (GLchan) (w00 * t00[1] + w10 * t10[1] + - w01 * t01[1] + w11 * t11[1] + 0.5); - rgba[2] = (GLchan) (w00 * t00[2] + w10 * t10[2] + - w01 * t01[2] + w11 * t11[2] + 0.5); - rgba[3] = (GLchan) (w00 * t00[3] + w10 * t10[3] + - w01 * t01[3] + w11 * t11[3] + 0.5); -#else /* CHAN_BITS == 8 */ - rgba[0] = (GLchan) ((w00 * t00[0] + w10 * t10[0] + - w01 * t01[0] + w11 * t11[0]) >> WEIGHT_SHIFT); - rgba[1] = (GLchan) ((w00 * t00[1] + w10 * t10[1] + - w01 * t01[1] + w11 * t11[1]) >> WEIGHT_SHIFT); - rgba[2] = (GLchan) ((w00 * t00[2] + w10 * t10[2] + - w01 * t01[2] + w11 * t11[2]) >> WEIGHT_SHIFT); - rgba[3] = (GLchan) ((w00 * t00[3] + w10 * t10[3] + - w01 * t01[3] + w11 * t11[3]) >> WEIGHT_SHIFT); + rgba[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5); + rgba[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5); + rgba[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5); + rgba[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5); +#else + ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE); + rgba[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]); + rgba[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]); + rgba[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]); + rgba[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]); #endif - } - } @@ -1144,8 +1181,15 @@ sample_linear_2d( GLcontext *ctx, GLuint texUnit, struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel]; (void) texUnit; (void) lambda; - for (i=0;i<n;i++) { - sample_2d_linear(ctx, tObj, image, texcoords[i], rgba[i]); + if (tObj->WrapS == GL_REPEAT && tObj->WrapT == GL_REPEAT) { + for (i=0;i<n;i++) { + sample_2d_linear_repeat(ctx, tObj, image, texcoords[i], rgba[i]); + } + } + else { + for (i=0;i<n;i++) { + sample_2d_linear(ctx, tObj, image, texcoords[i], rgba[i]); + } } } @@ -1444,32 +1488,15 @@ sample_3d_linear(GLcontext *ctx, const GLfloat a = FRAC(u); const GLfloat b = FRAC(v); const GLfloat c = FRAC(w); - -#if CHAN_TYPE == GL_FLOAT || CHAN_TYPE == GL_UNSIGNED_SHORT - /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */ - GLfloat w000 = (1.0F-a) * (1.0F-b) * (1.0F-c); - GLfloat w100 = a * (1.0F-b) * (1.0F-c); - GLfloat w010 = (1.0F-a) * b * (1.0F-c); - GLfloat w110 = a * b * (1.0F-c); - GLfloat w001 = (1.0F-a) * (1.0F-b) * c ; - GLfloat w101 = a * (1.0F-b) * c ; - GLfloat w011 = (1.0F-a) * b * c ; - GLfloat w111 = a * b * c ; -#else /* CHAN_BITS == 8 */ - /* compute sample weights in fixed point in [0,WEIGHT_SCALE] */ - GLint w000 = IROUND_POS((1.0F-a) * (1.0F-b) * (1.0F-c) * WEIGHT_SCALE); - GLint w100 = IROUND_POS( a * (1.0F-b) * (1.0F-c) * WEIGHT_SCALE); - GLint w010 = IROUND_POS((1.0F-a) * b * (1.0F-c) * WEIGHT_SCALE); - GLint w110 = IROUND_POS( a * b * (1.0F-c) * WEIGHT_SCALE); - GLint w001 = IROUND_POS((1.0F-a) * (1.0F-b) * c * WEIGHT_SCALE); - GLint w101 = IROUND_POS( a * (1.0F-b) * c * WEIGHT_SCALE); - GLint w011 = IROUND_POS((1.0F-a) * b * c * WEIGHT_SCALE); - GLint w111 = IROUND_POS( a * b * c * WEIGHT_SCALE); +#if CHAN_TYPE == GL_UNSIGNED_BYTE + const GLint ia = IROUND_POS(a * ILERP_SCALE); + const GLint ib = IROUND_POS(b * ILERP_SCALE); + const GLint ic = IROUND_POS(c * ILERP_SCALE); #endif - GLchan t000[4], t010[4], t001[4], t011[4]; GLchan t100[4], t110[4], t101[4], t111[4]; + /* Fetch texels */ if (useBorderColor & (I0BIT | J0BIT | K0BIT)) { COPY_CHAN4(t000, tObj->_BorderChan); } @@ -1520,51 +1547,48 @@ sample_3d_linear(GLcontext *ctx, img->FetchTexelc(img, i1, j1, k1, t111); } + /* trilinear interpolation of samples */ #if CHAN_TYPE == GL_FLOAT - rgba[0] = w000*t000[0] + w010*t010[0] + w001*t001[0] + w011*t011[0] + - w100*t100[0] + w110*t110[0] + w101*t101[0] + w111*t111[0]; - rgba[1] = w000*t000[1] + w010*t010[1] + w001*t001[1] + w011*t011[1] + - w100*t100[1] + w110*t110[1] + w101*t101[1] + w111*t111[1]; - rgba[2] = w000*t000[2] + w010*t010[2] + w001*t001[2] + w011*t011[2] + - w100*t100[2] + w110*t110[2] + w101*t101[2] + w111*t111[2]; - rgba[3] = w000*t000[3] + w010*t010[3] + w001*t001[3] + w011*t011[3] + - w100*t100[3] + w110*t110[3] + w101*t101[3] + w111*t111[3]; + rgba[0] = lerp_3d(a, b, c, + t000[0], t100[0], t010[0], t110[0], + t001[0], t101[0], t011[0], t111[0]); + rgba[1] = lerp_3d(a, b, c, + t000[1], t100[1], t010[1], t110[1], + t001[1], t101[1], t011[1], t111[1]); + rgba[2] = lerp_3d(a, b, c, + t000[2], t100[2], t010[2], t110[2], + t001[2], t101[2], t011[2], t111[2]); + rgba[3] = lerp_3d(a, b, c, + t000[3], t100[3], t010[3], t110[3], + t001[3], t101[3], t011[3], t111[3]); #elif CHAN_TYPE == GL_UNSIGNED_SHORT - rgba[0] = (GLchan) (w000*t000[0] + w010*t010[0] + - w001*t001[0] + w011*t011[0] + - w100*t100[0] + w110*t110[0] + - w101*t101[0] + w111*t111[0] + 0.5); - rgba[1] = (GLchan) (w000*t000[1] + w010*t010[1] + - w001*t001[1] + w011*t011[1] + - w100*t100[1] + w110*t110[1] + - w101*t101[1] + w111*t111[1] + 0.5); - rgba[2] = (GLchan) (w000*t000[2] + w010*t010[2] + - w001*t001[2] + w011*t011[2] + - w100*t100[2] + w110*t110[2] + - w101*t101[2] + w111*t111[2] + 0.5); - rgba[3] = (GLchan) (w000*t000[3] + w010*t010[3] + - w001*t001[3] + w011*t011[3] + - w100*t100[3] + w110*t110[3] + - w101*t101[3] + w111*t111[3] + 0.5); -#else /* CHAN_BITS == 8 */ - rgba[0] = (GLchan) ( - (w000*t000[0] + w010*t010[0] + w001*t001[0] + w011*t011[0] + - w100*t100[0] + w110*t110[0] + w101*t101[0] + w111*t111[0] ) - >> WEIGHT_SHIFT); - rgba[1] = (GLchan) ( - (w000*t000[1] + w010*t010[1] + w001*t001[1] + w011*t011[1] + - w100*t100[1] + w110*t110[1] + w101*t101[1] + w111*t111[1] ) - >> WEIGHT_SHIFT); - rgba[2] = (GLchan) ( - (w000*t000[2] + w010*t010[2] + w001*t001[2] + w011*t011[2] + - w100*t100[2] + w110*t110[2] + w101*t101[2] + w111*t111[2] ) - >> WEIGHT_SHIFT); - rgba[3] = (GLchan) ( - (w000*t000[3] + w010*t010[3] + w001*t001[3] + w011*t011[3] + - w100*t100[3] + w110*t110[3] + w101*t101[3] + w111*t111[3] ) - >> WEIGHT_SHIFT); + rgba[0] = (GLchan) (lerp_3d(a, b, c, + t000[0], t100[0], t010[0], t110[0], + t001[0], t101[0], t011[0], t111[0]) + 0.5F); + rgba[1] = (GLchan) (lerp_3d(a, b, c, + t000[1], t100[1], t010[1], t110[1], + t001[1], t101[1], t011[1], t111[1]) + 0.5F); + rgba[2] = (GLchan) (lerp_3d(a, b, c, + t000[2], t100[2], t010[2], t110[2], + t001[2], t101[2], t011[2], t111[2]) + 0.5F); + rgba[3] = (GLchan) (lerp_3d(a, b, c, + t000[3], t100[3], t010[3], t110[3], + t001[3], t101[3], t011[3], t111[3]) + 0.5F); +#else + ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE); + rgba[0] = ilerp_3d(ia, ib, ic, + t000[0], t100[0], t010[0], t110[0], + t001[0], t101[0], t011[0], t111[0]); + rgba[1] = ilerp_3d(ia, ib, ic, + t000[1], t100[1], t010[1], t110[1], + t001[1], t101[1], t011[1], t111[1]); + rgba[2] = ilerp_3d(ia, ib, ic, + t000[2], t100[2], t010[2], t110[2], + t001[2], t101[2], t011[2], t111[2]); + rgba[3] = ilerp_3d(ia, ib, ic, + t000[3], t100[3], t010[3], t110[3], + t001[3], t101[3], t011[3], t111[3]); #endif - } } @@ -2150,8 +2174,11 @@ sample_linear_rect(GLcontext *ctx, GLuint texUnit, GLfloat frow, fcol; GLint i0, j0, i1, j1; GLchan t00[4], t01[4], t10[4], t11[4]; - GLfloat a, b, w00, w01, w10, w11; + GLfloat a, b; GLuint useBorderColor = 0; +#if CHAN_TYPE == GL_UNSIGNED_BYTE + GLint ia, ib; +#endif /* NOTE: we DO NOT use [0, 1] texture coordinates! */ if (tObj->WrapS == GL_CLAMP) { @@ -2225,23 +2252,32 @@ sample_linear_rect(GLcontext *ctx, GLuint texUnit, else img->FetchTexelc(img, i1, j1, 0, t11); - /* compute sample weights */ + /* compute interpolants */ a = FRAC(fcol); b = FRAC(frow); - w00 = (1.0F-a) * (1.0F-b); - w10 = a * (1.0F-b); - w01 = (1.0F-a) * b ; - w11 = a * b ; - - /* compute weighted average of samples */ - rgba[i][0] = - (GLchan) (w00 * t00[0] + w10 * t10[0] + w01 * t01[0] + w11 * t11[0]); - rgba[i][1] = - (GLchan) (w00 * t00[1] + w10 * t10[1] + w01 * t01[1] + w11 * t11[1]); - rgba[i][2] = - (GLchan) (w00 * t00[2] + w10 * t10[2] + w01 * t01[2] + w11 * t11[2]); - rgba[i][3] = - (GLchan) (w00 * t00[3] + w10 * t10[3] + w01 * t01[3] + w11 * t11[3]); +#if CHAN_TYPE == GL_UNSIGNED_BYTE + ia = IROUND_POS(a * ILERP_SCALE); + ib = IROUND_POS(b * ILERP_SCALE); +#endif + + /* do bilinear interpolation of texel colors */ +#if CHAN_TYPE == GL_FLOAT + rgba[i][0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]); + rgba[i][1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]); + rgba[i][2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]); + rgba[i][3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]); +#elif CHAN_TYPE == GL_UNSIGNED_SHORT + rgba[i][0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5); + rgba[i][1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5); + rgba[i][2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5); + rgba[i][3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5); +#else + ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE); + rgba[i][0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]); + rgba[i][1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]); + rgba[i][2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]); + rgba[i][3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]); +#endif } } @@ -2456,12 +2492,8 @@ sample_depth_texture( GLcontext *ctx, GLuint unit, /* compute a single weighted depth sample and do one comparison */ const GLfloat a = FRAC(u + 1.0F); const GLfloat b = FRAC(v + 1.0F); - const GLfloat w00 = (1.0F - a) * (1.0F - b); - const GLfloat w10 = ( a) * (1.0F - b); - const GLfloat w01 = (1.0F - a) * ( b); - const GLfloat w11 = ( a) * ( b); - const GLfloat depthSample = w00 * depth00 + w10 * depth10 - + w01 * depth01 + w11 * depth11; + const GLfloat depthSample + = lerp_2d(a, b, depth00, depth10, depth01, depth11); if ((depthSample <= texcoords[i][2] && function == GL_LEQUAL) || (depthSample >= texcoords[i][2] && function == GL_GEQUAL)) { result = ambient; @@ -2532,12 +2564,8 @@ sample_depth_texture( GLcontext *ctx, GLuint unit, { const GLfloat a = FRAC(u + 1.0F); const GLfloat b = FRAC(v + 1.0F); - const GLfloat w00 = (1.0F - a) * (1.0F - b); - const GLfloat w10 = ( a) * (1.0F - b); - const GLfloat w01 = (1.0F - a) * ( b); - const GLfloat w11 = ( a) * ( b); - const GLfloat depthSample = w00 * depth00 + w10 * depth10 - + w01 * depth01 + w11 * depth11; + const GLfloat depthSample + = lerp_2d(a, b, depth00, depth10, depth01, depth11); CLAMPED_FLOAT_TO_CHAN(result, depthSample); } break; |