gallium: introduce get_shader_param (ALL DRIVERS CHANGED) (v3)

Changes in v3:
- Also change trace, which I forgot about

Changes in v2:
- No longer adds tessellation shaders

Currently each shader cap has FS and VS versions.

However, we want a version of them for geometry, tessellation control,
and tessellation evaluation shaders, and want to be able to easily
query a given cap type for a given shader stage.

Since having 5 duplicates of each shader cap is unmanageable, add
a new get_shader_param function that takes both a shader cap from a
new enum and a shader stage.

Drivers with non-unified shaders will first switch on the shader
and, within each case, switch on the cap.

Drivers with unified shaders instead first check whether the shader
is supported, and then switch on the cap.

MAX_CONST_BUFFERS is now per-stage.
The geometry shader cap is removed in favor of checking whether the
limit of geometry shader instructions is greater than 0, which is also
used for tessellation shaders.

WARNING: all drivers changed and compiled but only nvfx tested

5 files changed, 64 insertions, 11 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.h b/src/gallium/auxiliary/draw/draw_context.h
index 4c780e4dcb..4f0d30123a 100644
--- a/src/gallium/auxiliary/draw/draw_context.h
+++ b/src/gallium/auxiliary/draw/draw_context.h
@@ -39,6 +39,7 @@
 
 
 #include "pipe/p_state.h"
+#include "tgsi/tgsi_exec.h"
 
 struct pipe_context;
 struct draw_context;
@@ -225,4 +226,16 @@ boolean draw_need_pipeline(const struct draw_context *draw,
                            const struct pipe_rasterizer_state *rasterizer,
                            unsigned prim );
 
+static INLINE int
+draw_get_shader_param(unsigned shader, enum pipe_cap param)
+{
+   switch(shader) {
+   case PIPE_SHADER_VERTEX:
+   case PIPE_SHADER_GEOMETRY:
+      return tgsi_exec_get_shader_param(param);
+   default:
+      return 0;
+   }
+}
+
 #endif /* DRAW_CONTEXT_H */
diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.h b/src/gallium/auxiliary/tgsi/tgsi_exec.h
index 6dee362d58..9d62c1d7e7 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.h
@@ -377,6 +377,36 @@ tgsi_exec_set_constant_buffers(struct tgsi_exec_machine *mach,
                                const unsigned *buf_sizes);
 
 
+static INLINE int
+tgsi_exec_get_shader_param(enum pipe_shader_cap param)
+{
+   switch(param) {
+   case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
+   case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
+   case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
+   case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
+      return INT_MAX;
+   case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
+      return TGSI_EXEC_MAX_NESTING;
+   case PIPE_SHADER_CAP_MAX_INPUTS:
+      return TGSI_EXEC_MAX_INPUT_ATTRIBS;
+   case PIPE_SHADER_CAP_MAX_CONSTS:
+      return TGSI_EXEC_MAX_CONST_BUFFER;
+   case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
+      return PIPE_MAX_CONSTANT_BUFFERS;
+   case PIPE_SHADER_CAP_MAX_TEMPS:
+      return TGSI_EXEC_NUM_TEMPS;
+   case PIPE_SHADER_CAP_MAX_ADDRS:
+      return TGSI_EXEC_NUM_ADDRS;
+   case PIPE_SHADER_CAP_MAX_PREDS:
+      return TGSI_EXEC_NUM_PREDS;
+   case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
+      return 1;
+   default:
+      return 0;
+   }
+}
+
 #if defined __cplusplus
 } /* extern "C" */
 #endif
diff --git a/src/gallium/auxiliary/util/u_caps.c b/src/gallium/auxiliary/util/u_caps.c
index 94d5bd3027..f6a87869c7 100644
--- a/src/gallium/auxiliary/util/u_caps.c
+++ b/src/gallium/auxiliary/util/u_caps.c
@@ -75,6 +75,13 @@ util_check_caps_out(struct pipe_screen *screen, const unsigned *list, int *out)
             return FALSE;
          }
          break;
+      case UTIL_CAPS_CHECK_SHADER:
+         tmpi = screen->get_shader_param(screen, list[i] >> 24, list[i] & ((1 << 24) - 1));
+         ++i;
+         if (tmpi < (int)list[i++]) {
+            *out = i - 3;
+            return FALSE;
+         }
       case UTIL_CAPS_CHECK_UNIMPLEMENTED:
          *out = i - 1;
          return FALSE;
@@ -188,17 +195,17 @@ static unsigned caps_opengl_2_1[] = {
 
 /* Shader Model 3 */
 static unsigned caps_sm3[] = {
-    UTIL_CHECK_INT(MAX_FS_INSTRUCTIONS, 512),
-    UTIL_CHECK_INT(MAX_FS_INPUTS, 10),
-    UTIL_CHECK_INT(MAX_FS_TEMPS, 32),
-    UTIL_CHECK_INT(MAX_FS_ADDRS, 1),
-    UTIL_CHECK_INT(MAX_FS_CONSTS, 224),
+    UTIL_CHECK_SHADER(FRAGMENT, MAX_INSTRUCTIONS, 512),
+    UTIL_CHECK_SHADER(FRAGMENT, MAX_INPUTS, 10),
+    UTIL_CHECK_SHADER(FRAGMENT, MAX_TEMPS, 32),
+    UTIL_CHECK_SHADER(FRAGMENT, MAX_ADDRS, 1),
+    UTIL_CHECK_SHADER(FRAGMENT, MAX_CONSTS, 224),
 
-    UTIL_CHECK_INT(MAX_VS_INSTRUCTIONS, 512),
-    UTIL_CHECK_INT(MAX_VS_INPUTS, 16),
-    UTIL_CHECK_INT(MAX_VS_TEMPS, 32),
-    UTIL_CHECK_INT(MAX_VS_ADDRS, 2),
-    UTIL_CHECK_INT(MAX_VS_CONSTS, 256),
+    UTIL_CHECK_SHADER(VERTEX, MAX_INSTRUCTIONS, 512),
+    UTIL_CHECK_SHADER(VERTEX, MAX_INPUTS, 16),
+    UTIL_CHECK_SHADER(VERTEX, MAX_TEMPS, 32),
+    UTIL_CHECK_SHADER(VERTEX, MAX_ADDRS, 2),
+    UTIL_CHECK_SHADER(VERTEX, MAX_CONSTS, 256),
 
     UTIL_CHECK_TERMINATE
 };
diff --git a/src/gallium/auxiliary/util/u_caps.h b/src/gallium/auxiliary/util/u_caps.h
index b1074f9eb2..7bd2380041 100644
--- a/src/gallium/auxiliary/util/u_caps.h
+++ b/src/gallium/auxiliary/util/u_caps.h
@@ -38,6 +38,7 @@ enum u_caps_check_enum {
    UTIL_CAPS_CHECK_INT,
    UTIL_CAPS_CHECK_FLOAT,
    UTIL_CAPS_CHECK_FORMAT,
+   UTIL_CAPS_CHECK_SHADER,
    UTIL_CAPS_CHECK_UNIMPLEMENTED,
 };
 
@@ -54,6 +55,9 @@ enum u_caps_check_enum {
 #define UTIL_CHECK_FORMAT(format) \
    UTIL_CAPS_CHECK_FORMAT, PIPE_FORMAT_##format
 
+#define UTIL_CHECK_SHADER(shader, cap, higher) \
+   UTIL_CAPS_CHECK_SHADER, (PIPE_SHADER_##shader << 24) | PIPE_SHADER_CAP_##cap, (unsigned)(higher)
+
 #define UTIL_CHECK_UNIMPLEMENTED \
    UTIL_CAPS_CHECK_UNIMPLEMENTED
 
diff --git a/src/gallium/auxiliary/util/u_inlines.h b/src/gallium/auxiliary/util/u_inlines.h
index 78473bf35a..6ed39561fb 100644
--- a/src/gallium/auxiliary/util/u_inlines.h
+++ b/src/gallium/auxiliary/util/u_inlines.h
@@ -399,7 +399,6 @@ static INLINE boolean util_get_offset(
    }
 }
 
-
 #ifdef __cplusplus
 }
 #endif