compiler: Move gl_program::TexelFetchSamplers to shader_info.

I'd like to put this sort of metadata in the shader_info structure,
rather than adding more things to gl_program.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/compiler/shader_info.h

@@ -70,6 +70,9 @@ typedef struct shader_info {
    /* Whether or not this shader ever uses textureGather() */
    bool uses_texture_gather;
 
+   /** Bitfield of which textures are used by texelFetch() */
+   uint32_t textures_used_by_txf;
+
    /* The size of the gl_ClipDistance[] array, if declared. */
    unsigned clip_distance_array_size;
 

src/mesa/main/mtypes.h

@@ -2088,7 +2088,6 @@ struct gl_program
    GLbitfield TexturesUsed[MAX_COMBINED_TEXTURE_IMAGE_UNITS];  /**< TEXTURE_x_BIT bitmask */
    GLbitfield SamplersUsed;   /**< Bitfield of which samplers are used */
    GLbitfield ShadowSamplers; /**< Texture units used for shadow sampling. */
-   GLbitfield TexelFetchSamplers; /**< Texture units used for texelFetch*(). */
    GLbitfield ExternalSamplersUsed; /**< Texture units used for samplerExternalOES */
 
    /* Fragement shader only fields */

src/mesa/state_tracker/st_atom_texture.c

@@ -106,7 +106,7 @@ update_textures(struct st_context *st,
 {
    const GLuint old_max = *out_num_textures;
    GLbitfield samplers_used = prog->SamplersUsed;
-   GLbitfield texel_fetch_samplers = prog->TexelFetchSamplers;
+   GLbitfield texel_fetch_samplers = prog->info.textures_used_by_txf;
    GLbitfield free_slots = ~prog->SamplersUsed;
    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
    GLuint unit;

src/mesa/state_tracker/st_glsl_to_tgsi.cpp

@@ -4460,6 +4460,7 @@ count_resources(glsl_to_tgsi_visitor *v, gl_program *prog)
 {
    v->samplers_used = 0;
    v->images_used = 0;
+   prog->info.textures_used_by_txf = 0;
 
    foreach_in_list(glsl_to_tgsi_instruction, inst, &v->instructions) {
       if (inst->info->is_tex) {
@@ -4473,7 +4474,7 @@ count_resources(glsl_to_tgsi_visitor *v, gl_program *prog)
                st_translate_texture_target(inst->tex_target, inst->tex_shadow);
 
             if (inst->op == TGSI_OPCODE_TXF || inst->op == TGSI_OPCODE_TXF_LZ) {
-               prog->TexelFetchSamplers |= 1u << idx;
+               prog->info.textures_used_by_txf |= 1u << idx;
             }
          }
       }