diff options
| -rw-r--r-- | src/mesa/pipe/softpipe/sp_tex_sample.c | 156 |
1 files changed, 154 insertions, 2 deletions
diff --git a/src/mesa/pipe/softpipe/sp_tex_sample.c b/src/mesa/pipe/softpipe/sp_tex_sample.c index de8e01ea07e..df64c81769b 100644 --- a/src/mesa/pipe/softpipe/sp_tex_sample.c +++ b/src/mesa/pipe/softpipe/sp_tex_sample.c @@ -338,6 +338,115 @@ linear_texcoord(GLuint wrapMode, GLfloat s, GLuint size, } +static GLuint +choose_cube_face(const GLfloat texcoord[4], GLfloat newCoord[4]) +{ + /* + 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 GLfloat rx = texcoord[0]; + const GLfloat ry = texcoord[1]; + const GLfloat rz = texcoord[2]; + const GLfloat arx = FABSF(rx), ary = FABSF(ry), arz = FABSF(rz); + GLuint face; + GLfloat 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; + } + } + + newCoord[0] = ( sc / ma + 1.0F ) * 0.5F; + newCoord[1] = ( tc / ma + 1.0F ) * 0.5F; + + return face; +} + + +static void +sp_get_sample_1d(struct tgsi_sampler *sampler, + const GLfloat strq[4], GLfloat rgba[4]) +{ + struct pipe_context *pipe = (struct pipe_context *) sampler->pipe; + struct pipe_surface *ps + = pipe->get_tex_surface(pipe, sampler->texture, 0, 0, 0); + + switch (sampler->state->min_filter) { + case PIPE_TEX_FILTER_NEAREST: + { + GLint x; + x = nearest_texcoord(sampler->state->wrap_s, strq[0], + sampler->texture->width0); + ps->get_tile(ps, x, 0, 1, 1, rgba); + } + break; + case PIPE_TEX_FILTER_LINEAR: + { + GLfloat t0[4], t1[4]; + GLint x0, x1; + GLfloat a; + linear_texcoord(sampler->state->wrap_s, strq[0], + sampler->texture->width0, &x0, &x1, &a); + ps->get_tile(ps, x0, 0, 1, 1, t0); + ps->get_tile(ps, x1, 0, 1, 1, t1); + + 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]); + } + break; + default: + assert(0); + } +} + /** * Called via tgsi_sampler::get_sample() @@ -352,8 +461,8 @@ linear_texcoord(GLuint wrapMode, GLfloat s, GLuint size, * a new tgsi_sampler object for each state combo it finds.... */ void -sp_get_sample(struct tgsi_sampler *sampler, - const GLfloat strq[4], GLfloat rgba[4]) +sp_get_sample_2d(struct tgsi_sampler *sampler, + const GLfloat strq[4], GLfloat rgba[4]) { struct pipe_context *pipe = (struct pipe_context *) sampler->pipe; struct pipe_surface *ps @@ -394,3 +503,46 @@ sp_get_sample(struct tgsi_sampler *sampler, assert(0); } } + + +static void +sp_get_sample_3d(struct tgsi_sampler *sampler, + const GLfloat strq[4], GLfloat rgba[4]) +{ + /* get/map pipe_surfaces corresponding to 3D tex slices */ +} + + +static void +sp_get_sample_cube(struct tgsi_sampler *sampler, + const GLfloat strq[4], GLfloat rgba[4]) +{ + GLfloat st[4]; + GLuint face = choose_cube_face(strq, st); + + /* get/map surface corresponding to the face */ +} + + +void +sp_get_sample(struct tgsi_sampler *sampler, + const GLfloat strq[4], GLfloat rgba[4]) +{ + switch (sampler->texture->target) { + case GL_TEXTURE_1D: + sp_get_sample_1d(sampler, strq, rgba); + break; + case GL_TEXTURE_2D: + sp_get_sample_2d(sampler, strq, rgba); + break; + case GL_TEXTURE_3D: + sp_get_sample_3d(sampler, strq, rgba); + break; + case GL_TEXTURE_CUBE_MAP: + sp_get_sample_cube(sampler, strq, rgba); + break; + default: + assert(0); + } +} + |