mesa: fix vertex array validation test for attribute 0 (vert pos)

We don't actually need vertex array[0] enabled when using a vertex
program/shader.

cherry-picked from master

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index 9144b4b..2eb96ae 100644 (file)
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -59,9 +59,10 @@ _mesa_validate_DrawElements(GLcontext *ctx,
    if (ctx->NewState)
       _mesa_update_state(ctx);
 
-   /* Always need vertex positions */
-   if (!ctx->Array.ArrayObj->Vertex.Enabled
-       && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
+   /* Always need vertex positions, unless a vertex program is in use */
+   if (!ctx->VertexProgram._Current &&
+       !ctx->Array.ArrayObj->Vertex.Enabled &&
+       !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
       return GL_FALSE;
 
    /* Vertex buffer object tests */
@@ -177,9 +178,10 @@ _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
    if (ctx->NewState)
       _mesa_update_state(ctx);
 
-   /* Always need vertex positions */
-   if (!ctx->Array.ArrayObj->Vertex.Enabled
-       && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
+   /* Always need vertex positions, unless a vertex program is in use */
+   if (!ctx->VertexProgram._Current &&
+       !ctx->Array.ArrayObj->Vertex.Enabled &&
+       !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
       return GL_FALSE;
 
    /* Vertex buffer object tests */
@@ -247,8 +249,10 @@ _mesa_validate_DrawArrays(GLcontext *ctx,
    if (ctx->NewState)
       _mesa_update_state(ctx);
 
-   /* Always need vertex positions */
-   if (!ctx->Array.ArrayObj->Vertex.Enabled && !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
+   /* Always need vertex positions, unless a vertex program is in use */
+   if (!ctx->VertexProgram._Current &&
+       !ctx->Array.ArrayObj->Vertex.Enabled &&
+       !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
       return GL_FALSE;
 
    if (ctx->Const.CheckArrayBounds) {