[Mesa-dev] [PATCH v3 1/2] mesa: add missing queries for ARB_direct_state_access

[Daniel Scharrer]

This adds index queries (glGet*i_v) for GL_TEXTURE_BINDING_* and
GL_SAMPLER_BINDING, as well as textue queries
(glGetTex{,ture}Parameter*) for GL_TEXTURE_TARGET.

CC: "10.6" <mesa-stable at lists.freedesktop.org>
---
v3: fixed uper limit for texture units
    don't use extension suffixes for core tokens
    mention added queries in commit message
    don't check if the sampler object has been deleted in another ctx

v2: added CC for 10.6
    renamed _mesa_tex_target_to_index to tex_target_to_index
    moved declaration of variable before code
    added missing spaces in ternary operators

 src/mesa/main/get.c      | 86 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/mesa/main/texparam.c | 12 +++++++
 2 files changed, 98 insertions(+)

diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index 307a5ff..f524eb2 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -35,6 +35,7 @@
 #include "mtypes.h"
 #include "state.h"
 #include "texcompress.h"
+#include "texstate.h"
 #include "framebuffer.h"
 #include "samplerobj.h"
 #include "stencil.h"
@@ -1785,6 +1786,52 @@ _mesa_GetDoublev(GLenum pname, GLdouble *params)
    }
 }
 
+/**
+ * Convert a GL texture binding enum such as GL_TEXTURE_BINDING_2D
+ * into the corresponding Mesa texture target index.
+ * \return TEXTURE_x_INDEX or -1 if binding is invalid
+ */
+static int
+tex_binding_to_index(const struct gl_context *ctx, GLenum binding)
+{
+   switch (binding) {
+   case GL_TEXTURE_BINDING_1D:
+      return _mesa_is_desktop_gl(ctx) ? TEXTURE_1D_INDEX : -1;
+   case GL_TEXTURE_BINDING_2D:
+      return TEXTURE_2D_INDEX;
+   case GL_TEXTURE_BINDING_3D:
+      return ctx->API != API_OPENGLES ? TEXTURE_3D_INDEX : -1;
+   case GL_TEXTURE_BINDING_CUBE_MAP:
+      return ctx->Extensions.ARB_texture_cube_map
+         ? TEXTURE_CUBE_INDEX : -1;
+   case GL_TEXTURE_BINDING_RECTANGLE:
+      return _mesa_is_desktop_gl(ctx) && ctx->Extensions.NV_texture_rectangle
+         ? TEXTURE_RECT_INDEX : -1;
+   case GL_TEXTURE_BINDING_1D_ARRAY:
+      return _mesa_is_desktop_gl(ctx) && ctx->Extensions.EXT_texture_array
+         ? TEXTURE_1D_ARRAY_INDEX : -1;
+   case GL_TEXTURE_BINDING_2D_ARRAY:
+      return (_mesa_is_desktop_gl(ctx) && ctx->Extensions.EXT_texture_array)
+         || _mesa_is_gles3(ctx)
+         ? TEXTURE_2D_ARRAY_INDEX : -1;
+   case GL_TEXTURE_BINDING_BUFFER:
+      return ctx->API == API_OPENGL_CORE &&
+             ctx->Extensions.ARB_texture_buffer_object ?
+             TEXTURE_BUFFER_INDEX : -1;
+   case GL_TEXTURE_BINDING_CUBE_MAP_ARRAY:
+      return _mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_texture_cube_map_array
+         ? TEXTURE_CUBE_ARRAY_INDEX : -1;
+   case GL_TEXTURE_BINDING_2D_MULTISAMPLE:
+      return _mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_texture_multisample
+         ? TEXTURE_2D_MULTISAMPLE_INDEX : -1;
+   case GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY:
+      return _mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_texture_multisample
+         ? TEXTURE_2D_MULTISAMPLE_ARRAY_INDEX : -1;
+   default:
+      return -1;
+   }
+}
+
 static enum value_type
 find_value_indexed(const char *func, GLenum pname, GLuint index, union value *v)
 {
@@ -2048,6 +2095,45 @@ find_value_indexed(const char *func, GLenum pname, GLuint index, union value *v)
       v->value_int = ctx->ImageUnits[index].Format;
       return TYPE_INT;
 
+   /* ARB_direct_state_access */
+   case GL_TEXTURE_BINDING_1D:
+   case GL_TEXTURE_BINDING_1D_ARRAY:
+   case GL_TEXTURE_BINDING_2D:
+   case GL_TEXTURE_BINDING_2D_ARRAY:
+   case GL_TEXTURE_BINDING_2D_MULTISAMPLE:
+   case GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY:
+   case GL_TEXTURE_BINDING_3D:
+   case GL_TEXTURE_BINDING_BUFFER:
+   case GL_TEXTURE_BINDING_CUBE_MAP:
+   case GL_TEXTURE_BINDING_CUBE_MAP_ARRAY:
+   case GL_TEXTURE_BINDING_RECTANGLE: {
+      int target;
+
+      if (ctx->API != API_OPENGL_CORE)
+         goto invalid_enum;
+      target = tex_binding_to_index(ctx, pname);
+      if (target < 0)
+         goto invalid_enum;
+      if (index >= _mesa_max_tex_unit(ctx))
+         goto invalid_value;
+
+      v->value_int = ctx->Texture.Unit[index].CurrentTex[target]->Name;
+      return TYPE_INT;
+   }
+
+   case GL_SAMPLER_BINDING: {
+      struct gl_sampler_object *samp;
+
+      if (ctx->API != API_OPENGL_CORE)
+         goto invalid_enum;
+      if (index >= _mesa_max_tex_unit(ctx))
+         goto invalid_value;
+
+      samp = ctx->Texture.Unit[index].Sampler;
+      v->value_int = samp ? samp->Name : 0;
+      return TYPE_INT;
+   }
+
    case GL_MAX_COMPUTE_WORK_GROUP_COUNT:
       if (!_mesa_is_desktop_gl(ctx) || !ctx->Extensions.ARB_compute_shader)
          goto invalid_enum;
diff --git a/src/mesa/main/texparam.c b/src/mesa/main/texparam.c
index 5500eed..8d5739b 100644
--- a/src/mesa/main/texparam.c
+++ b/src/mesa/main/texparam.c
@@ -1908,6 +1908,12 @@ get_tex_parameterfv(struct gl_context *ctx,
          *params = (GLfloat) obj->Sampler.sRGBDecode;
          break;
 
+      case GL_TEXTURE_TARGET:
+         if (ctx->API != API_OPENGL_CORE)
+            goto invalid_pname;
+         *params = ENUM_TO_FLOAT(obj->Target);
+         break;
+
       default:
          goto invalid_pname;
    }
@@ -2133,6 +2139,12 @@ get_tex_parameteriv(struct gl_context *ctx,
          *params = obj->ImageFormatCompatibilityType;
          break;
 
+      case GL_TEXTURE_TARGET:
+         if (ctx->API != API_OPENGL_CORE)
+            goto invalid_pname;
+         *params = (GLint) obj->Target;
+         break;
+
       default:
          goto invalid_pname;
    }
-- 
2.5.0