From 375e73d85948b43aa509e25f0a210ebd10238b6f Mon Sep 17 00:00:00 2001
From: Marek Olšák <maraeo@gmail.com>
Date: Sun, 18 Dec 2011 02:43:31 +0100
Subject: mesa: implement glGet queries and error handling for
 ARB_transform_feedback3

Acked-by: Ian Romanick <ian.d.romanick@intel.com>
---
 src/mesa/main/context.c           |  1 +
 src/mesa/main/get.c               |  9 +++++++++
 src/mesa/main/mtypes.h            |  1 +
 src/mesa/main/transformfeedback.c | 32 ++++++++++++++++++++++++++++++++
 4 files changed, 43 insertions(+)

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 7de714b818a..d5ccce076b9 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -655,6 +655,7 @@ _mesa_init_constants(struct gl_context *ctx)
    ctx->Const.MaxTransformFeedbackBuffers = MAX_FEEDBACK_BUFFERS;
    ctx->Const.MaxTransformFeedbackSeparateComponents = 4 * MAX_FEEDBACK_ATTRIBS;
    ctx->Const.MaxTransformFeedbackInterleavedComponents = 4 * MAX_FEEDBACK_ATTRIBS;
+   ctx->Const.MaxVertexStreams = 1;
 
    /** GL_ARB_uniform_buffer_object */
    ctx->Const.MaxCombinedUniformBlocks = 36;
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index cff4cf39455..15de321e400 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -328,6 +328,7 @@ EXTRA_EXT(ARB_sync);
 EXTRA_EXT(ARB_vertex_shader);
 EXTRA_EXT(EXT_transform_feedback);
 EXTRA_EXT(ARB_transform_feedback2);
+EXTRA_EXT(ARB_transform_feedback3);
 EXTRA_EXT(EXT_pixel_buffer_object);
 EXTRA_EXT(ARB_vertex_program);
 EXTRA_EXT2(NV_point_sprite, ARB_point_sprite);
@@ -1247,6 +1248,14 @@ static const struct value_desc values[] = {
    { GL_TRANSFORM_FEEDBACK_BINDING, LOC_CUSTOM, TYPE_INT, 0,
      extra_ARB_transform_feedback2 },
 
+   /* GL_ARB_transform_feedback3 */
+   { GL_MAX_TRANSFORM_FEEDBACK_BUFFERS,
+     CONTEXT_INT(Const.MaxTransformFeedbackBuffers),
+     extra_ARB_transform_feedback3 },
+   { GL_MAX_VERTEX_STREAMS,
+     CONTEXT_INT(Const.MaxVertexStreams),
+     extra_ARB_transform_feedback3 },
+
    /* GL_ARB_geometry_shader4 */
    { GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_ARB,
      CONTEXT_INT(Const.MaxGeometryTextureImageUnits),
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 276bfe5c1f5..578ac9485d7 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2837,6 +2837,7 @@ struct gl_constants
    GLuint MaxTransformFeedbackBuffers;
    GLuint MaxTransformFeedbackSeparateComponents;
    GLuint MaxTransformFeedbackInterleavedComponents;
+   GLuint MaxVertexStreams;
 
    /** GL_EXT_gpu_shader4 */
    GLint MinProgramTexelOffset, MaxProgramTexelOffset;
diff --git a/src/mesa/main/transformfeedback.c b/src/mesa/main/transformfeedback.c
index 6f822120105..7679b4b0853 100644
--- a/src/mesa/main/transformfeedback.c
+++ b/src/mesa/main/transformfeedback.c
@@ -603,6 +603,38 @@ _mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
       return;
    }
 
+   if (ctx->Extensions.ARB_transform_feedback3) {
+      if (bufferMode == GL_INTERLEAVED_ATTRIBS) {
+         unsigned buffers = 1;
+
+         for (i = 0; i < count; i++) {
+            if (strcmp(varyings[i], "gl_NextBuffer") == 0)
+               buffers++;
+         }
+
+         if (buffers > ctx->Const.MaxTransformFeedbackBuffers) {
+            _mesa_error(ctx, GL_INVALID_OPERATION,
+                        "glTransformFeedbackVaryings(too many gl_NextBuffer "
+                        "occurences)");
+            return;
+         }
+      } else {
+         for (i = 0; i < count; i++) {
+            if (strcmp(varyings[i], "gl_NextBuffer") == 0 ||
+                strcmp(varyings[i], "gl_SkipComponents1") == 0 ||
+                strcmp(varyings[i], "gl_SkipComponents2") == 0 ||
+                strcmp(varyings[i], "gl_SkipComponents3") == 0 ||
+                strcmp(varyings[i], "gl_SkipComponents4") == 0) {
+               _mesa_error(ctx, GL_INVALID_OPERATION,
+                           "glTransformFeedbackVaryings(SEPARATE_ATTRIBS,"
+                           "varying=%s)",
+                           varyings[i]);
+               return;
+            }
+         }
+      }
+   }
+
    /* free existing varyings, if any */
    for (i = 0; i < shProg->TransformFeedback.NumVarying; i++) {
       free(shProg->TransformFeedback.VaryingNames[i]);
-- 
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