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mesa: Add NV_fog_distance to the fixed-function vertex program generator

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This is all that is needed to implement NV_fog_distance on programmable
hardware.
This commit is contained in:
Nicholas Miell 2011-09-19 23:17:00 -07:00 • committed by Marek Olšák
parent 740467dd62
commit fadd5e1b00
1 changed files with 39 additions and 4 deletions
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43
src/mesa/main/ffvertex_prog.c
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@ -61,6 +61,7 @@ struct state_key {
unsigned rescale_normals:1;
unsigned fog_source_is_depth:1;
unsigned fog_distance_mode:2;
unsigned separate_specular:1;
unsigned point_attenuated:1;
unsigned point_array:1;
@ -108,7 +109,22 @@ static GLuint translate_texgen( GLboolean enabled, GLenum mode )
}
}
#define FDM_EYE_RADIAL 0
#define FDM_EYE_PLANE 1
#define FDM_EYE_PLANE_ABS 2
static GLuint translate_fog_distance_mode( GLenum mode )
{
switch (mode) {
case GL_EYE_RADIAL_NV:
return FDM_EYE_RADIAL;
case GL_EYE_PLANE:
return FDM_EYE_PLANE;
default: /* shouldn't happen; fall through to a sensible default */
case GL_EYE_PLANE_ABSOLUTE_NV:
return FDM_EYE_PLANE_ABS;
}
}
static GLboolean check_active_shininess( struct gl_context *ctx,
const struct state_key *key,
@ -205,8 +221,10 @@ static void make_state_key( struct gl_context *ctx, struct state_key *key )
if (ctx->Transform.RescaleNormals)
key->rescale_normals = 1;
if (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT)
if (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT) {
key->fog_source_is_depth = 1;
key->fog_distance_mode = translate_fog_distance_mode(ctx->Fog.FogDistanceMode);
}
if (ctx->Point._Attenuated)
key->point_attenuated = 1;
@ -1308,14 +1326,31 @@ static void build_fog( struct tnl_program *p )
struct ureg input;
if (p->state->fog_source_is_depth) {
input = get_eye_position_z(p);
switch (p->state->fog_distance_mode) {
case FDM_EYE_RADIAL: /* Z = sqrt(Xe*Xe + Ye*Ye + Ze*Ze) */
input = get_eye_position(p);
emit_op2(p, OPCODE_DP3, fog, WRITEMASK_X, input, input);
emit_op1(p, OPCODE_RSQ, fog, WRITEMASK_X, fog);
emit_op1(p, OPCODE_RCP, fog, WRITEMASK_X, fog);
break;
case FDM_EYE_PLANE: /* Z = Ze */
input = get_eye_position_z(p);
emit_op1(p, OPCODE_MOV, fog, WRITEMASK_X, input);
break;
case FDM_EYE_PLANE_ABS: /* Z = abs(Ze) */
input = get_eye_position_z(p);
emit_op1(p, OPCODE_ABS, fog, WRITEMASK_X, input);
break;
default: assert(0); break; /* can't happen */
}
}
else {
input = swizzle1(register_input(p, VERT_ATTRIB_FOG), X);
emit_op1(p, OPCODE_ABS, fog, WRITEMASK_X, input);
}
/* result.fog = {abs(f),0,0,1}; */
emit_op1(p, OPCODE_ABS, fog, WRITEMASK_X, input);
emit_op1(p, OPCODE_MOV, fog, WRITEMASK_YZW, get_identity_param(p));
}