From 29107d4e07144f41614f053aa1fc49ccf225fedf Mon Sep 17 00:00:00 2001
From: Kristian Høgsberg <krh@bitplanet.net>
Date: Wed, 21 Apr 2010 16:14:18 -0400
Subject: mesa: Compute GL version according to API

---
 src/mesa/main/version.c | 128 ++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 107 insertions(+), 21 deletions(-)

(limited to 'src/mesa/main/version.c')

diff --git a/src/mesa/main/version.c b/src/mesa/main/version.c
index a39b680650..dea3019d0b 100644
--- a/src/mesa/main/version.c
+++ b/src/mesa/main/version.c
@@ -32,8 +32,11 @@
  * Return major and minor version numbers.
  */
 static void
-compute_version(const GLcontext *ctx, GLuint *major, GLuint *minor)
+compute_version(GLcontext *ctx)
 {
+   GLuint major, minor;
+   static const int max = 100;
+
    const GLboolean ver_1_3 = (ctx->Extensions.ARB_multisample &&
                               ctx->Extensions.ARB_multitexture &&
                               ctx->Extensions.ARB_texture_border_clamp &&
@@ -85,31 +88,111 @@ compute_version(const GLcontext *ctx, GLuint *major, GLuint *minor)
                               ctx->Extensions.EXT_pixel_buffer_object &&
                               ctx->Extensions.EXT_texture_sRGB);
    if (ver_2_1) {
-      *major = 2;
-      *minor = 1;
+      major = 2;
+      minor = 1;
    }
    else if (ver_2_0) {
-      *major = 2;
-      *minor = 0;
+      major = 2;
+      minor = 0;
    }
    else if (ver_1_5) {
-      *major = 1;
-      *minor = 5;
+      major = 1;
+      minor = 5;
    }
    else if (ver_1_4) {
-      *major = 1;
-      *minor = 4;
+      major = 1;
+      minor = 4;
    }
    else if (ver_1_3) {
-      *major = 1;
-      *minor = 3;
+      major = 1;
+      minor = 3;
    }
    else {
-      *major = 1;
-      *minor = 2;
+      major = 1;
+      minor = 2;
+   }
+
+   ctx->VersionMajor = major;
+   ctx->VersionMinor = minor;
+   ctx->VersionString = (char *) malloc(max);
+   if (ctx->VersionString) {
+      _mesa_snprintf(ctx->VersionString, max,
+		     "%u.%u Mesa " MESA_VERSION_STRING,
+		     ctx->VersionMajor, ctx->VersionMinor);
    }
 }
 
+static void
+compute_version_es1(GLcontext *ctx)
+{
+   static const int max = 100;
+
+   /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
+   const GLboolean ver_1_0 = (ctx->Extensions.ARB_multisample &&
+                              ctx->Extensions.ARB_multitexture &&
+                              ctx->Extensions.ARB_texture_compression &&
+                              ctx->Extensions.EXT_texture_env_add &&
+                              ctx->Extensions.ARB_texture_env_combine &&
+                              ctx->Extensions.ARB_texture_env_dot3);
+   /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
+   const GLboolean ver_1_1 = (ver_1_0 &&
+                              ctx->Extensions.EXT_point_parameters &&
+                              ctx->Extensions.SGIS_generate_mipmap &&
+                              ctx->Extensions.ARB_vertex_buffer_object);
+
+   if (ver_1_1) {
+      ctx->VersionMajor = 1;
+      ctx->VersionMinor = 1;
+   } else if (ver_1_0) {
+      ctx->VersionMajor = 1;
+      ctx->VersionMinor = 0;
+   } else {
+      _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
+   }
+
+   ctx->VersionString = (char *) malloc(max);
+   if (ctx->VersionString) {
+      _mesa_snprintf(ctx->VersionString, max,
+		     "OpenGL ES-CM 1.%d Mesa " MESA_VERSION_STRING,
+		     ctx->VersionMinor);
+   }
+}
+
+static void
+compute_version_es2(GLcontext *ctx)
+{
+   static const int max = 100;
+
+   /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
+   const GLboolean ver_2_0 = (ctx->Extensions.ARB_multisample &&
+                              ctx->Extensions.ARB_multitexture &&
+                              ctx->Extensions.ARB_texture_compression &&
+                              ctx->Extensions.ARB_texture_cube_map &&
+                              ctx->Extensions.ARB_texture_mirrored_repeat &&
+                              ctx->Extensions.EXT_blend_color &&
+                              ctx->Extensions.EXT_blend_func_separate &&
+                              ctx->Extensions.EXT_blend_minmax &&
+                              ctx->Extensions.EXT_blend_subtract &&
+                              ctx->Extensions.EXT_stencil_wrap &&
+                              ctx->Extensions.ARB_vertex_buffer_object &&
+                              ctx->Extensions.ARB_shader_objects &&
+                              ctx->Extensions.ARB_vertex_shader &&
+                              ctx->Extensions.ARB_fragment_shader &&
+                              ctx->Extensions.ARB_texture_non_power_of_two &&
+                              ctx->Extensions.EXT_blend_equation_separate);
+   if (ver_2_0) {
+      ctx->VersionMajor = 2;
+      ctx->VersionMinor = 0;
+   } else {
+      _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
+   }
+
+   ctx->VersionString = (char *) malloc(max);
+   if (ctx->VersionString) {
+      _mesa_snprintf(ctx->VersionString, max,
+		     "OpenGL ES 2.0 Mesa " MESA_VERSION_STRING);
+   }
+}
 
 /**
  * Set the context's VersionMajor, VersionMinor, VersionString fields.
@@ -118,13 +201,16 @@ compute_version(const GLcontext *ctx, GLuint *major, GLuint *minor)
 void
 _mesa_compute_version(GLcontext *ctx)
 {
-   static const int max = 100;
-
-   compute_version(ctx, &ctx->VersionMajor, &ctx->VersionMinor);
-   
-   ctx->VersionString = (char *) malloc(max);
-   if (ctx->VersionString) {
-      _mesa_snprintf(ctx->VersionString, max, "%u.%u Mesa " MESA_VERSION_STRING,
-	       ctx->VersionMajor, ctx->VersionMinor);
+   switch (ctx->API) {
+   case API_OPENGL:
+      compute_version(ctx);
+      break;
+   case API_OPENGLES:
+      compute_version_es1(ctx);
+      break;
+   case API_OPENGLES2:
+      compute_version_es2(ctx);
+      break;
    }
+
 }
-- 
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