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-rw-r--r--src/mesa/pipe/softpipe/sp_tex_sample.c916
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diff --git a/src/mesa/pipe/softpipe/sp_tex_sample.c b/src/mesa/pipe/softpipe/sp_tex_sample.c
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--- a/src/mesa/pipe/softpipe/sp_tex_sample.c
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-/**************************************************************************
- *
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * 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"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
- * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- **************************************************************************/
-
-/**
- * Texture sampling
- *
- * Authors:
- * Brian Paul
- */
-
-#include "sp_context.h"
-#include "sp_headers.h"
-#include "sp_surface.h"
-#include "sp_tex_sample.h"
-#include "sp_tile_cache.h"
-#include "pipe/p_context.h"
-#include "pipe/p_defines.h"
-#include "pipe/p_util.h"
-#include "pipe/tgsi/exec/tgsi_exec.h"
-
-
-/*
- * Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
- * see 1-pixel bands of improperly weighted linear-filtered textures.
- * The tests/texwrap.c demo is a good test.
- * Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
- * Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
- */
-#define FRAC(f) ((f) - ifloor(f))
-
-
-/**
- * Linear interpolation macro
- */
-#define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) )
-
-
-/**
- * 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 float
-lerp_2d(float a, float b,
- float v00, float v10, float v01, float v11)
-{
- const float temp0 = LERP(a, v00, v10);
- const float temp1 = LERP(a, v01, v11);
- return LERP(b, temp0, temp1);
-}
-
-
-/**
- * If A is a signed integer, A % B doesn't give the right value for A < 0
- * (in terms of texture repeat). Just casting to unsigned fixes that.
- */
-#define REMAINDER(A, B) ((unsigned) (A) % (unsigned) (B))
-
-
-/**
- * Apply texture coord wrapping mode and return integer texture index.
- * \param wrapMode PIPE_TEX_WRAP_x
- * \param s the texcoord
- * \param size the texture image size
- * \return integer texture index
- */
-static INLINE int
-nearest_texcoord(unsigned wrapMode, float s, unsigned size)
-{
- int i;
- switch (wrapMode) {
- case PIPE_TEX_WRAP_REPEAT:
- /* s limited to [0,1) */
- /* i limited to [0,size-1] */
- i = ifloor(s * size);
- i = REMAINDER(i, size);
- return i;
- case PIPE_TEX_WRAP_CLAMP:
- /* s limited to [0,1] */
- /* i limited to [0,size-1] */
- if (s <= 0.0F)
- i = 0;
- else if (s >= 1.0F)
- i = size - 1;
- else
- i = ifloor(s * size);
- return i;
- case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
- {
- /* s limited to [min,max] */
- /* i limited to [0, size-1] */
- const float min = 1.0F / (2.0F * size);
- const float max = 1.0F - min;
- if (s < min)
- i = 0;
- else if (s > max)
- i = size - 1;
- else
- i = ifloor(s * size);
- }
- return i;
- case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
- {
- /* s limited to [min,max] */
- /* i limited to [-1, size] */
- const float min = -1.0F / (2.0F * size);
- const float max = 1.0F - min;
- if (s <= min)
- i = -1;
- else if (s >= max)
- i = size;
- else
- i = ifloor(s * size);
- }
- return i;
- case PIPE_TEX_WRAP_MIRROR_REPEAT:
- {
- const float min = 1.0F / (2.0F * size);
- const float max = 1.0F - min;
- const int flr = ifloor(s);
- float u;
- if (flr & 1)
- u = 1.0F - (s - (float) flr);
- else
- u = s - (float) flr;
- if (u < min)
- i = 0;
- else if (u > max)
- i = size - 1;
- else
- i = ifloor(u * size);
- }
- return i;
- case PIPE_TEX_WRAP_MIRROR_CLAMP:
- {
- /* s limited to [0,1] */
- /* i limited to [0,size-1] */
- const float u = FABSF(s);
- if (u <= 0.0F)
- i = 0;
- else if (u >= 1.0F)
- i = size - 1;
- else
- i = ifloor(u * size);
- }
- return i;
- case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
- {
- /* s limited to [min,max] */
- /* i limited to [0, size-1] */
- const float min = 1.0F / (2.0F * size);
- const float max = 1.0F - min;
- const float u = FABSF(s);
- if (u < min)
- i = 0;
- else if (u > max)
- i = size - 1;
- else
- i = ifloor(u * size);
- }
- return i;
- case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
- {
- /* s limited to [min,max] */
- /* i limited to [0, size-1] */
- const float min = -1.0F / (2.0F * size);
- const float max = 1.0F - min;
- const float u = FABSF(s);
- if (u < min)
- i = -1;
- else if (u > max)
- i = size;
- else
- i = ifloor(u * size);
- }
- return i;
- default:
- assert(0);
- return 0;
- }
-}
-
-
-/**
- * Used to compute texel locations for linear sampling.
- * \param wrapMode PIPE_TEX_WRAP_x
- * \param s the texcoord
- * \param size the texture image size
- * \param i0 returns first texture index
- * \param i1 returns second texture index (usually *i0 + 1)
- * \param a returns blend factor/weight between texture indexes
- */
-static INLINE void
-linear_texcoord(unsigned wrapMode, float s, unsigned size,
- int *i0, int *i1, float *a)
-{
- float u;
- switch (wrapMode) {
- case PIPE_TEX_WRAP_REPEAT:
- u = s * size - 0.5F;
- *i0 = REMAINDER(ifloor(u), size);
- *i1 = REMAINDER(*i0 + 1, size);
- break;
- case PIPE_TEX_WRAP_CLAMP:
- if (s <= 0.0F)
- u = 0.0F;
- else if (s >= 1.0F)
- u = (float) size;
- else
- u = s * size;
- u -= 0.5F;
- *i0 = ifloor(u);
- *i1 = *i0 + 1;
- break;
- case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
- if (s <= 0.0F)
- u = 0.0F;
- else if (s >= 1.0F)
- u = (float) size;
- else
- u = s * size;
- u -= 0.5F;
- *i0 = ifloor(u);
- *i1 = *i0 + 1;
- if (*i0 < 0)
- *i0 = 0;
- if (*i1 >= (int) size)
- *i1 = size - 1;
- break;
- case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
- {
- const float min = -1.0F / (2.0F * size);
- const float max = 1.0F - min;
- if (s <= min)
- u = min * size;
- else if (s >= max)
- u = max * size;
- else
- u = s * size;
- u -= 0.5F;
- *i0 = ifloor(u);
- *i1 = *i0 + 1;
- }
- break;
- case PIPE_TEX_WRAP_MIRROR_REPEAT:
- {
- const int flr = ifloor(s);
- if (flr & 1)
- u = 1.0F - (s - (float) flr);
- else
- u = s - (float) flr;
- u = (u * size) - 0.5F;
- *i0 = ifloor(u);
- *i1 = *i0 + 1;
- if (*i0 < 0)
- *i0 = 0;
- if (*i1 >= (int) size)
- *i1 = size - 1;
- }
- break;
- case PIPE_TEX_WRAP_MIRROR_CLAMP:
- u = FABSF(s);
- if (u >= 1.0F)
- u = (float) size;
- else
- u *= size;
- u -= 0.5F;
- *i0 = ifloor(u);
- *i1 = *i0 + 1;
- break;
- case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
- u = FABSF(s);
- if (u >= 1.0F)
- u = (float) size;
- else
- u *= size;
- u -= 0.5F;
- *i0 = ifloor(u);
- *i1 = *i0 + 1;
- if (*i0 < 0)
- *i0 = 0;
- if (*i1 >= (int) size)
- *i1 = size - 1;
- break;
- case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
- {
- const float min = -1.0F / (2.0F * size);
- const float max = 1.0F - min;
- u = FABSF(s);
- if (u <= min)
- u = min * size;
- else if (u >= max)
- u = max * size;
- else
- u *= size;
- u -= 0.5F;
- *i0 = ifloor(u);
- *i1 = *i0 + 1;
- }
- break;
- default:
- assert(0);
- }
- *a = FRAC(u);
-}
-
-
-static unsigned
-choose_cube_face(float rx, float ry, float rz, float *newS, float *newT)
-{
- /*
- major axis
- direction target sc tc ma
- ---------- ------------------------------- --- --- ---
- +rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
- -rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
- +ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
- -ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
- +rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
- -rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
- */
- const float arx = FABSF(rx), ary = FABSF(ry), arz = FABSF(rz);
- unsigned face;
- float sc, tc, ma;
-
- if (arx > ary && arx > arz) {
- if (rx >= 0.0F) {
- face = PIPE_TEX_FACE_POS_X;
- sc = -rz;
- tc = -ry;
- ma = arx;
- }
- else {
- face = PIPE_TEX_FACE_NEG_X;
- sc = rz;
- tc = -ry;
- ma = arx;
- }
- }
- else if (ary > arx && ary > arz) {
- if (ry >= 0.0F) {
- face = PIPE_TEX_FACE_POS_Y;
- sc = rx;
- tc = rz;
- ma = ary;
- }
- else {
- face = PIPE_TEX_FACE_NEG_Y;
- sc = rx;
- tc = -rz;
- ma = ary;
- }
- }
- else {
- if (rz > 0.0F) {
- face = PIPE_TEX_FACE_POS_Z;
- sc = rx;
- tc = -ry;
- ma = arz;
- }
- else {
- face = PIPE_TEX_FACE_NEG_Z;
- sc = -rx;
- tc = -ry;
- ma = arz;
- }
- }
-
- *newS = ( sc / ma + 1.0F ) * 0.5F;
- *newT = ( tc / ma + 1.0F ) * 0.5F;
-
- return face;
-}
-
-
-/**
- * Examine the quad's texture coordinates to compute the partial
- * derivatives w.r.t X and Y, then compute lambda (level of detail).
- *
- * This is only done for fragment shaders, not vertex shaders.
- */
-static float
-compute_lambda(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias)
-{
- float rho, lambda;
-
- assert(s);
- {
- float dsdx = s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT];
- float dsdy = s[QUAD_TOP_LEFT] - s[QUAD_BOTTOM_LEFT];
- dsdx = FABSF(dsdx);
- dsdy = FABSF(dsdy);
- rho = MAX2(dsdx, dsdy);
- if (sampler->state->normalized_coords)
- rho *= sampler->texture->width[0];
- }
- if (t) {
- float dtdx = t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT];
- float dtdy = t[QUAD_TOP_LEFT] - t[QUAD_BOTTOM_LEFT];
- float max;
- dtdx = FABSF(dtdx);
- dtdy = FABSF(dtdy);
- max = MAX2(dtdx, dtdy);
- if (sampler->state->normalized_coords)
- max *= sampler->texture->height[0];
- rho = MAX2(rho, max);
- }
- if (p) {
- float dpdx = p[QUAD_BOTTOM_RIGHT] - p[QUAD_BOTTOM_LEFT];
- float dpdy = p[QUAD_TOP_LEFT] - p[QUAD_BOTTOM_LEFT];
- float max;
- dpdx = FABSF(dpdx);
- dpdy = FABSF(dpdy);
- max = MAX2(dpdx, dpdy);
- if (sampler->state->normalized_coords)
- max *= sampler->texture->depth[0];
- rho = MAX2(rho, max);
- }
-
- lambda = LOG2(rho);
- lambda += lodbias + sampler->state->lod_bias;
- lambda = CLAMP(lambda, sampler->state->min_lod, sampler->state->max_lod);
-
- return lambda;
-}
-
-
-/**
- * Do several things here:
- * 1. Compute lambda from the texcoords, if needed
- * 2. Determine if we're minifying or magnifying
- * 3. If minifying, choose mipmap levels
- * 4. Return image filter to use within mipmap images
- */
-static void
-choose_mipmap_levels(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- unsigned *level0, unsigned *level1, float *levelBlend,
- unsigned *imgFilter)
-{
- if (sampler->state->min_mip_filter == PIPE_TEX_MIPFILTER_NONE) {
- /* no mipmap selection needed */
- *imgFilter = sampler->state->mag_img_filter;
- *level0 = *level1 = (int) sampler->state->min_lod;
- }
- else {
- float lambda;
-
- if (1)
- /* fragment shader */
- lambda = compute_lambda(sampler, s, t, p, lodbias);
- else
- /* vertex shader */
- lambda = lodbias; /* not really a bias, but absolute LOD */
-
- if (lambda < 0.0) { /* XXX threshold depends on the filter */
- /* magnifying */
- *imgFilter = sampler->state->mag_img_filter;
- *level0 = *level1 = 0;
- }
- else {
- /* minifying */
- *imgFilter = sampler->state->min_img_filter;
-
- /* choose mipmap level(s) and compute the blend factor between them */
- if (sampler->state->min_mip_filter == PIPE_TEX_MIPFILTER_NEAREST) {
- /* Nearest mipmap level */
- const int lvl = (int) (lambda + 0.5);
- *level0 =
- *level1 = CLAMP(lvl, 0, (int) sampler->texture->last_level);
- }
- else {
- /* Linear interpolation between mipmap levels */
- const int lvl = (int) lambda;
- *level0 = CLAMP(lvl, 0, (int) sampler->texture->last_level);
- *level1 = CLAMP(lvl + 1, 0, (int) sampler->texture->last_level);
- *levelBlend = FRAC(lambda); /* blending weight between levels */
- }
- }
- }
-}
-
-
-/**
- * Get a texel from a texture, using the texture tile cache.
- *
- * \param face the cube face in 0..5
- * \param level the mipmap level
- * \param x the x coord of texel within 2D image
- * \param y the y coord of texel within 2D image
- * \param z which slice of a 3D texture
- * \param rgba the quad to put the texel/color into
- * \param j which element of the rgba quad to write to
- *
- * XXX maybe move this into sp_tile_cache.c and merge with the
- * sp_get_cached_tile_tex() function. Also, get 4 texels instead of 1...
- */
-static void
-get_texel(struct tgsi_sampler *sampler,
- unsigned face, unsigned level, int x, int y, int z,
- float rgba[NUM_CHANNELS][QUAD_SIZE], unsigned j)
-{
- const int tx = x % TILE_SIZE;
- const int ty = y % TILE_SIZE;
- const struct softpipe_cached_tile *tile
- = sp_get_cached_tile_tex(sampler->pipe, sampler->cache,
- x, y, z, face, level);
- rgba[0][j] = tile->data.color[ty][tx][0];
- rgba[1][j] = tile->data.color[ty][tx][1];
- rgba[2][j] = tile->data.color[ty][tx][2];
- rgba[3][j] = tile->data.color[ty][tx][3];
-}
-
-
-/**
- * Compare texcoord 'p' (aka R) against texture value 'rgba[0]'
- * When we sampled the depth texture, the depth value was put into all
- * RGBA channels. We look at the red channel here.
- */
-static INLINE void
-shadow_compare(uint compare_func,
- float rgba[NUM_CHANNELS][QUAD_SIZE],
- const float p[QUAD_SIZE],
- uint j)
-{
- int k;
- switch (compare_func) {
- case PIPE_FUNC_LESS:
- k = p[j] < rgba[0][j];
- break;
- case PIPE_FUNC_LEQUAL:
- k = p[j] <= rgba[0][j];
- break;
- case PIPE_FUNC_GREATER:
- k = p[j] > rgba[0][j];
- break;
- case PIPE_FUNC_GEQUAL:
- k = p[j] >= rgba[0][j];
- break;
- case PIPE_FUNC_EQUAL:
- k = p[j] == rgba[0][j];
- break;
- case PIPE_FUNC_NOTEQUAL:
- k = p[j] != rgba[0][j];
- break;
- case PIPE_FUNC_ALWAYS:
- k = 1;
- break;
- case PIPE_FUNC_NEVER:
- k = 0;
- break;
- default:
- assert(0);
- }
-
- rgba[0][j] = rgba[1][j] = rgba[2][j] = (float) k;
-}
-
-
-/**
- * Common code for sampling 1D/2D/cube textures.
- * Could probably extend for 3D...
- */
-static void
-sp_get_samples_2d_common(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE],
- const unsigned faces[4])
-{
- const uint compare_func = sampler->state->compare_func;
- unsigned level0, level1, j, imgFilter;
- int width, height;
- float levelBlend;
-
- choose_mipmap_levels(sampler, s, t, p, lodbias,
- &level0, &level1, &levelBlend, &imgFilter);
-
- if (sampler->state->normalized_coords) {
- width = sampler->texture->width[level0];
- height = sampler->texture->height[level0];
- }
- else {
- width = height = 1;
- }
-
- assert(width > 0);
-
- switch (imgFilter) {
- case PIPE_TEX_FILTER_NEAREST:
- for (j = 0; j < QUAD_SIZE; j++) {
- int x = nearest_texcoord(sampler->state->wrap_s, s[j], width);
- int y = nearest_texcoord(sampler->state->wrap_t, t[j], height);
- get_texel(sampler, faces[j], level0, x, y, 0, rgba, j);
- if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
- shadow_compare(compare_func, rgba, p, j);
- }
-
- if (level0 != level1) {
- /* get texels from second mipmap level and blend */
- float rgba2[4][4];
- unsigned c;
- x = x / 2;
- y = y / 2;
- get_texel(sampler, faces[j], level1, x, y, 0, rgba2, j);
- if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){
- shadow_compare(compare_func, rgba2, p, j);
- }
-
- for (c = 0; c < NUM_CHANNELS; c++) {
- rgba[c][j] = LERP(levelBlend, rgba[c][j], rgba2[c][j]);
- }
- }
- }
- break;
- case PIPE_TEX_FILTER_LINEAR:
- for (j = 0; j < QUAD_SIZE; j++) {
- float tx[4][4], a, b;
- int x0, y0, x1, y1, c;
- linear_texcoord(sampler->state->wrap_s, s[j], width, &x0, &x1, &a);
- linear_texcoord(sampler->state->wrap_t, t[j], height, &y0, &y1, &b);
- get_texel(sampler, faces[j], level0, x0, y0, 0, tx, 0);
- get_texel(sampler, faces[j], level0, x1, y0, 0, tx, 1);
- get_texel(sampler, faces[j], level0, x0, y1, 0, tx, 2);
- get_texel(sampler, faces[j], level0, x1, y1, 0, tx, 3);
- if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
- shadow_compare(compare_func, tx, p, 0);
- shadow_compare(compare_func, tx, p, 1);
- shadow_compare(compare_func, tx, p, 2);
- shadow_compare(compare_func, tx, p, 3);
- }
-
- for (c = 0; c < 4; c++) {
- rgba[c][j] = lerp_2d(a, b, tx[c][0], tx[c][1], tx[c][2], tx[c][3]);
- }
-
- if (level0 != level1) {
- /* get texels from second mipmap level and blend */
- float rgba2[4][4];
- x0 = x0 / 2;
- y0 = y0 / 2;
- x1 = x1 / 2;
- y1 = y1 / 2;
- get_texel(sampler, faces[j], level1, x0, y0, 0, tx, 0);
- get_texel(sampler, faces[j], level1, x1, y0, 0, tx, 1);
- get_texel(sampler, faces[j], level1, x0, y1, 0, tx, 2);
- get_texel(sampler, faces[j], level1, x1, y1, 0, tx, 3);
- if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){
- shadow_compare(compare_func, tx, p, 0);
- shadow_compare(compare_func, tx, p, 1);
- shadow_compare(compare_func, tx, p, 2);
- shadow_compare(compare_func, tx, p, 3);
- }
-
- for (c = 0; c < 4; c++) {
- rgba2[c][j] = lerp_2d(a, b,
- tx[c][0], tx[c][1], tx[c][2], tx[c][3]);
- }
-
- for (c = 0; c < NUM_CHANNELS; c++) {
- rgba[c][j] = LERP(levelBlend, rgba[c][j], rgba2[c][j]);
- }
- }
- }
- break;
- default:
- assert(0);
- }
-}
-
-
-static void
-sp_get_samples_1d(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- static const unsigned faces[4] = {0, 0, 0, 0};
- static const float tzero[4] = {0, 0, 0, 0};
- sp_get_samples_2d_common(sampler, s, tzero, NULL, lodbias, rgba, faces);
-}
-
-
-static void
-sp_get_samples_2d(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- static const unsigned faces[4] = {0, 0, 0, 0};
- sp_get_samples_2d_common(sampler, s, t, p, lodbias, rgba, faces);
-}
-
-
-static void
-sp_get_samples_3d(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- /* get/map pipe_surfaces corresponding to 3D tex slices */
- unsigned level0, level1, j, imgFilter;
- int width, height, depth;
- float levelBlend;
- const uint face = 0;
-
- choose_mipmap_levels(sampler, s, t, p, lodbias,
- &level0, &level1, &levelBlend, &imgFilter);
-
- if (sampler->state->normalized_coords) {
- width = sampler->texture->width[level0];
- height = sampler->texture->height[level0];
- depth = sampler->texture->depth[level0];
- }
- else {
- width = height = depth = 1;
- }
-
- assert(width > 0);
- assert(height > 0);
- assert(depth > 0);
-
- switch (imgFilter) {
- case PIPE_TEX_FILTER_NEAREST:
- for (j = 0; j < QUAD_SIZE; j++) {
- int x = nearest_texcoord(sampler->state->wrap_s, s[j], width);
- int y = nearest_texcoord(sampler->state->wrap_t, t[j], height);
- int z = nearest_texcoord(sampler->state->wrap_r, p[j], depth);
- get_texel(sampler, face, level0, x, y, z, rgba, j);
-
- if (level0 != level1) {
- /* get texels from second mipmap level and blend */
- float rgba2[4][4];
- unsigned c;
- x /= 2;
- y /= 2;
- z /= 2;
- get_texel(sampler, face, level1, x, y, z, rgba2, j);
- for (c = 0; c < NUM_CHANNELS; c++) {
- rgba[c][j] = LERP(levelBlend, rgba2[c][j], rgba[c][j]);
- }
- }
- }
- break;
- case PIPE_TEX_FILTER_LINEAR:
- for (j = 0; j < QUAD_SIZE; j++) {
- float texel0[4][4], texel1[4][4];
- float xw, yw, zw; /* interpolation weights */
- int x0, x1, y0, y1, z0, z1, c;
- linear_texcoord(sampler->state->wrap_s, s[j], width, &x0, &x1, &xw);
- linear_texcoord(sampler->state->wrap_t, t[j], height, &y0, &y1, &yw);
- linear_texcoord(sampler->state->wrap_r, p[j], depth, &z0, &z1, &zw);
- get_texel(sampler, face, level0, x0, y0, z0, texel0, 0);
- get_texel(sampler, face, level0, x1, y0, z0, texel0, 1);
- get_texel(sampler, face, level0, x0, y1, z0, texel0, 2);
- get_texel(sampler, face, level0, x1, y1, z0, texel0, 3);
- get_texel(sampler, face, level0, x0, y0, z1, texel1, 0);
- get_texel(sampler, face, level0, x1, y0, z1, texel1, 1);
- get_texel(sampler, face, level0, x0, y1, z1, texel1, 2);
- get_texel(sampler, face, level0, x1, y1, z1, texel1, 3);
-
- /* 3D lerp */
- for (c = 0; c < 4; c++) {
- float ctemp0[4][4], ctemp1[4][4];
- ctemp0[c][j] = lerp_2d(xw, yw,
- texel0[c][0], texel0[c][1],
- texel0[c][2], texel0[c][3]);
- ctemp1[c][j] = lerp_2d(xw, yw,
- texel1[c][0], texel1[c][1],
- texel1[c][2], texel1[c][3]);
- rgba[c][j] = LERP(zw, ctemp0[c][j], ctemp1[c][j]);
- }
-
- if (level0 != level1) {
- /* get texels from second mipmap level and blend */
- float rgba2[4][4];
- x0 /= 2;
- y0 /= 2;
- z0 /= 2;
- x1 /= 2;
- y1 /= 2;
- z1 /= 2;
- get_texel(sampler, face, level1, x0, y0, z0, texel0, 0);
- get_texel(sampler, face, level1, x1, y0, z0, texel0, 1);
- get_texel(sampler, face, level1, x0, y1, z0, texel0, 2);
- get_texel(sampler, face, level1, x1, y1, z0, texel0, 3);
- get_texel(sampler, face, level1, x0, y0, z1, texel1, 0);
- get_texel(sampler, face, level1, x1, y0, z1, texel1, 1);
- get_texel(sampler, face, level1, x0, y1, z1, texel1, 2);
- get_texel(sampler, face, level1, x1, y1, z1, texel1, 3);
-
- /* 3D lerp */
- for (c = 0; c < 4; c++) {
- float ctemp0[4][4], ctemp1[4][4];
- ctemp0[c][j] = lerp_2d(xw, yw,
- texel0[c][0], texel0[c][1],
- texel0[c][2], texel0[c][3]);
- ctemp1[c][j] = lerp_2d(xw, yw,
- texel1[c][0], texel1[c][1],
- texel1[c][2], texel1[c][3]);
- rgba2[c][j] = LERP(zw, ctemp0[c][j], ctemp1[c][j]);
- }
-
- /* blend mipmap levels */
- for (c = 0; c < NUM_CHANNELS; c++) {
- rgba[c][j] = LERP(levelBlend, rgba[c][j], rgba2[c][j]);
- }
- }
- }
- break;
- default:
- assert(0);
- }
-}
-
-
-static void
-sp_get_samples_cube(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- unsigned faces[QUAD_SIZE], j;
- float ssss[4], tttt[4];
- for (j = 0; j < QUAD_SIZE; j++) {
- faces[j] = choose_cube_face(s[j], t[j], p[j], ssss + j, tttt + j);
- }
- sp_get_samples_2d_common(sampler, ssss, tttt, NULL, lodbias, rgba, faces);
-}
-
-
-/**
- * Called via tgsi_sampler::get_samples()
- * Use the sampler's state setting to get a filtered RGBA value
- * from the sampler's texture.
- *
- * XXX we can implement many versions of this function, each
- * tightly coded for a specific combination of sampler state
- * (nearest + repeat), (bilinear mipmap + clamp), etc.
- *
- * The update_samplers() function in st_atom_sampler.c could create
- * a new tgsi_sampler object for each state combo it finds....
- */
-void
-sp_get_samples(struct tgsi_sampler *sampler,
- const float s[QUAD_SIZE],
- const float t[QUAD_SIZE],
- const float p[QUAD_SIZE],
- float lodbias,
- float rgba[NUM_CHANNELS][QUAD_SIZE])
-{
- if (!sampler->texture)
- return;
-
- switch (sampler->texture->target) {
- case PIPE_TEXTURE_1D:
- sp_get_samples_1d(sampler, s, t, p, lodbias, rgba);
- break;
- case PIPE_TEXTURE_2D:
- sp_get_samples_2d(sampler, s, t, p, lodbias, rgba);
- break;
- case PIPE_TEXTURE_3D:
- sp_get_samples_3d(sampler, s, t, p, lodbias, rgba);
- break;
- case PIPE_TEXTURE_CUBE:
- sp_get_samples_cube(sampler, s, t, p, lodbias, rgba);
- break;
- default:
- assert(0);
- }
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 00:11:05 +0000