st/mesa: use enum types instead of int/unsigned (v3)

Use the proper enum types for various variables.  Makes life in gdb
a little nicer.  Note that the size of enum bitfields must be one
larger so the high bit is always zero (for MSVC).

v2: also increase size of image_format bitfield, per Eric Engestrom.
v3: use the new ASSERT_BITFIELD_SIZE() macro

Reviewed-by: Charmaine Lee <charmainel@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/mesa/state_tracker/st_glsl_to_tgsi.cpp

@@ -189,10 +189,10 @@ public:
    int num_address_regs;
    uint32_t samplers_used;
    glsl_base_type sampler_types[PIPE_MAX_SAMPLERS];
-   int sampler_targets[PIPE_MAX_SAMPLERS];   /**< One of TGSI_TEXTURE_* */
+   enum tgsi_texture_type sampler_targets[PIPE_MAX_SAMPLERS];
    int images_used;
    int image_targets[PIPE_MAX_SHADER_IMAGES];
-   unsigned image_formats[PIPE_MAX_SHADER_IMAGES];
+   enum pipe_format image_formats[PIPE_MAX_SHADER_IMAGES];
    bool indirect_addr_consts;
    int wpos_transform_const;
 
@@ -6229,6 +6229,15 @@ st_translate_program(
    assert(numInputs <= ARRAY_SIZE(t->inputs));
    assert(numOutputs <= ARRAY_SIZE(t->outputs));
 
+   ASSERT_BITFIELD_SIZE(st_src_reg, type, GLSL_TYPE_ERROR);
+   ASSERT_BITFIELD_SIZE(st_dst_reg, type, GLSL_TYPE_ERROR);
+   ASSERT_BITFIELD_SIZE(glsl_to_tgsi_instruction, image_format, PIPE_FORMAT_COUNT);
+   ASSERT_BITFIELD_SIZE(glsl_to_tgsi_instruction, tex_target,
+                        (gl_texture_index) (NUM_TEXTURE_TARGETS - 1));
+   ASSERT_BITFIELD_SIZE(glsl_to_tgsi_instruction, image_format,
+                        (enum pipe_format) (PIPE_FORMAT_COUNT - 1));
+   ASSERT_BITFIELD_SIZE(glsl_to_tgsi_instruction, op, TGSI_OPCODE_LAST - 1);
+
    t = CALLOC_STRUCT(st_translate);
    if (!t) {
       ret = PIPE_ERROR_OUT_OF_MEMORY;
@@ -6549,7 +6558,8 @@ st_translate_program(
    /* texture samplers */
    for (i = 0; i < frag_const->MaxTextureImageUnits; i++) {
       if (program->samplers_used & (1u << i)) {
-         unsigned type = st_translate_texture_type(program->sampler_types[i]);
+         enum tgsi_return_type type =
+            st_translate_texture_type(program->sampler_types[i]);
 
          t->samplers[i] = ureg_DECL_sampler(ureg, i);
 

src/mesa/state_tracker/st_glsl_to_tgsi_private.h

@@ -127,13 +127,13 @@ public:
    unsigned is_64bit_expanded:1;
    unsigned sampler_base:5;
    unsigned sampler_array_size:6; /**< 1-based size of sampler array, 1 if not array */
-   unsigned tex_target:4; /**< One of TEXTURE_*_INDEX */
+   gl_texture_index tex_target:5;
    glsl_base_type tex_type:5;
    unsigned tex_shadow:1;
-   unsigned image_format:9;
+   enum pipe_format image_format:10;
    unsigned tex_offset_num_offset:3;
    unsigned dead_mask:4; /**< Used in dead code elimination */
-   unsigned buffer_access:3; /**< buffer access type */
+   unsigned buffer_access:3; /**< bitmask of TGSI_MEMORY_x bits */
 
    const struct tgsi_opcode_info *info;
 };

src/mesa/state_tracker/st_mesa_to_tgsi.c

@@ -164,8 +164,8 @@ src_register(struct st_translate *t,
 /**
  * Map mesa texture target to TGSI texture target.
  */
-unsigned
+enum tgsi_texture_type
-st_translate_texture_target(GLuint textarget, GLboolean shadow)
+st_translate_texture_target(gl_texture_index textarget, GLboolean shadow)
 {
    if (shadow) {
       switch (textarget) {
@@ -223,7 +223,7 @@ st_translate_texture_target(GLuint textarget, GLboolean shadow)
 /**
  * Map GLSL base type to TGSI return type.
  */
-unsigned
+enum tgsi_return_type
 st_translate_texture_type(enum glsl_base_type type)
 {
    switch (type) {

src/mesa/state_tracker/st_mesa_to_tgsi.h

@@ -30,6 +30,7 @@
 #define ST_MESA_TO_TGSI_H
 
 #include "main/glheader.h"
+#include "main/mtypes.h"
 
 #include "pipe/p_compiler.h"
 #include "pipe/p_defines.h"
@@ -62,10 +63,10 @@ st_translate_mesa_program(
    const ubyte outputSemanticName[],
    const ubyte outputSemanticIndex[]);
 
-unsigned
+enum tgsi_texture_type
-st_translate_texture_target(GLuint textarget, GLboolean shadow);
+st_translate_texture_target(gl_texture_index textarget, GLboolean shadow);
 
-unsigned
+enum tgsi_return_type
 st_translate_texture_type(enum glsl_base_type type);
 
 #if defined __cplusplus