Determine GL extensions/limits by making pipe queries.

The state tracker calls pipe->get_param() to determine the GL limits and
which OpenGL extensions are supported.
This is an initial implementation that'll probably change...

1 files changed, 186 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
new file mode 100644
index 0000000000..3f56b537bb
--- /dev/null
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -0,0 +1,186 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+#include "main/imports.h"
+#include "main/context.h"
+#include "main/extensions.h"
+#include "main/macros.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+
+#include "st_context.h"
+#include "st_extensions.h"
+
+
+/*
+ * Compute floor(log_base_2(n)).
+ * If n < 0 return -1.
+ */
+static int
+logbase2( int n )
+{
+   GLint i = 1;
+   GLint log2 = 0;
+
+   if (n < 0)
+      return -1;
+
+   if (n == 0)
+      return 0;
+
+   while ( n > i ) {
+      i *= 2;
+      log2++;
+   }
+   if (i != n) {
+      return log2 - 1;
+   }
+   else {
+      return log2;
+   }
+}
+
+
+void st_init_limits(struct st_context *st)
+{
+   struct pipe_context *pipe = st->pipe;
+   GLcontext *ctx = st->ctx;
+   uint w, h, d;
+
+   ctx->Const.MaxTextureImageUnits
+      = ctx->Const.MaxTextureCoordUnits
+      = pipe->get_param(pipe, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS);
+
+   pipe->max_texture_size(pipe, PIPE_TEXTURE_2D, &w, &h, &d);
+   ctx->Const.MaxTextureLevels = logbase2(w) + 1;
+   ctx->Const.MaxTextureRectSize = w;
+
+   pipe->max_texture_size(pipe, PIPE_TEXTURE_3D, &w, &h, &d);
+   ctx->Const.Max3DTextureLevels = logbase2(d) + 1;
+
+   pipe->max_texture_size(pipe, PIPE_TEXTURE_CUBE, &w, &h, &d);
+   ctx->Const.MaxCubeTextureLevels = logbase2(w) + 1;
+   
+   ctx->Const.MaxDrawBuffers = MAX2(1, pipe->get_param(pipe, PIPE_CAP_MAX_RENDER_TARGETS));
+
+}
+
+
+/**
+ * XXX this needs careful review
+ */
+void st_init_extensions(struct st_context *st)
+{
+   struct pipe_context *pipe = st->pipe;
+   GLcontext *ctx = st->ctx;
+
+   /*
+    * Extensions that are supported by all Gallium drivers:
+    */
+   ctx->Extensions.ARB_fragment_program = GL_TRUE;
+   ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
+   ctx->Extensions.ARB_vertex_program = GL_TRUE;
+   ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
+
+   ctx->Extensions.EXT_blend_color = GL_TRUE;
+   ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
+   ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
+   ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
+   ctx->Extensions.EXT_blend_minmax = GL_TRUE;
+   ctx->Extensions.EXT_blend_subtract = GL_TRUE;
+   ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
+   ctx->Extensions.EXT_fog_coord = GL_TRUE;
+   ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
+   ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
+   ctx->Extensions.EXT_point_parameters = GL_TRUE;
+   ctx->Extensions.EXT_secondary_color = GL_TRUE;
+   ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_add = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
+   ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
+
+   ctx->Extensions.NV_blend_square = GL_TRUE;
+   ctx->Extensions.NV_texgen_reflection = GL_TRUE;
+
+
+   /*
+    * Extensions that depend on the driver/hardware:
+    */
+   if (pipe->get_param(pipe, PIPE_CAP_MAX_RENDER_TARGETS) > 1) {
+      ctx->Extensions.ARB_draw_buffers = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_GLSL) > 1) {
+      ctx->Extensions.ARB_fragment_shader = GL_TRUE;
+      ctx->Extensions.ARB_vertex_shader = GL_TRUE;
+      ctx->Extensions.ARB_shader_objects = GL_TRUE;
+      ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
+      ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_NPOT_TEXTURES)) {
+      ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
+      ctx->Extensions.NV_texture_rectangle = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {
+      ctx->Extensions.ARB_multitexture = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_TWO_SIDED_STENCIL) > 1) {
+      ctx->Extensions.ATI_separate_stencil = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_S3TC) > 1) {
+      ctx->Extensions.ARB_texture_compression = GL_TRUE;
+      ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_ANISOTROPIC_FILTER)) {
+      ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_POINT_SPRITE)) {
+      ctx->Extensions.ARB_point_sprite = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_OCCLUSION_QUERY) > 1) {
+      ctx->Extensions.ARB_occlusion_query = GL_TRUE;
+   }
+
+   if (pipe->get_param(pipe, PIPE_CAP_TEXTURE_SHADOW_MAP) > 1) {
+      ctx->Extensions.ARB_depth_texture = GL_TRUE;
+      ctx->Extensions.ARB_shadow = GL_TRUE;
+      /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
+   }
+
+}