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sketch out 1D/3D/cube texture sampling

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This commit is contained in:
Brian 2007-08-08 10:26:51 -06:00
parent eb147ed775
commit 34a48abd5f
1 changed files with 154 additions and 2 deletions
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156
src/mesa/pipe/softpipe/sp_tex_sample.c
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@ -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);
}
}