meta: Don't use integer handles for shaders or programs.

Previously, we gave our internal clear/blit shaders actual GL handles
and stored them in the shader/program hash table.  We used ordinary
GL API entrypoints to work with them.

We thought this shouldn't be a problem because GL doesn't allow
applications to invent their own names for shaders or programs.
GL allocates all names via glCreateShader and glCreateProgram.

However, having them in the hash table is a bit risky: if a broken
application guesses the name of our shaders or programs, it could
alter them, potentially screwing up future meta operations.

Also, test cases can observe the programs in the hash table.  Running
a single dEQP process that executes the following test list:

dEQP-GLES3.functional.negative_api.buffer.clear
dEQP-GLES3.functional.negative_api.shader.compile_shader
dEQP-GLES3.functional.negative_api.shader.delete_shader

would result in the last two tests breaking.  The compile_shader test
calls glCompileShader(9) straight away, and since it hasn't even created
any shaders or programs, it expects to get a GL_INVALID_VALUE error
because there's no such name.  However, because the clear test ran
first, it created Meta programs, so an object named "9" did exist.

This patch reworks Meta to work with gl_shader and gl_shader_program
pointers directly.  These internal programs have bogus names, and are
never stored in the hash tables, so they're invisible to applications.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94485
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>

7 files changed, 130 insertions, 147 deletions

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index bdcf316e455..b673db44b0b 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -121,72 +121,51 @@ _mesa_meta_framebuffer_texture_image(struct gl_context *ctx,
                              level, layer, false, __func__);
 }
 
-GLuint
+struct gl_shader *
 _mesa_meta_compile_shader_with_debug(struct gl_context *ctx, GLenum target,
                                      const GLcharARB *source)
 {
-   GLuint shader;
-   GLint ok, size;
-   GLchar *info;
-
-   shader = _mesa_CreateShader(target);
-   _mesa_ShaderSource(shader, 1, &source, NULL);
-   _mesa_CompileShader(shader);
-
-   _mesa_GetShaderiv(shader, GL_COMPILE_STATUS, &ok);
-   if (ok)
-      return shader;
-
-   _mesa_GetShaderiv(shader, GL_INFO_LOG_LENGTH, &size);
-   if (size == 0) {
-      _mesa_DeleteShader(shader);
-      return 0;
-   }
+   const GLuint name = ~0;
+   struct gl_shader *sh;
+
+   sh = ctx->Driver.NewShader(ctx, name, target);
+   sh->Source = strdup(source);
+   sh->CompileStatus = false;
+   _mesa_compile_shader(ctx, sh);
+
+   if (!sh->CompileStatus) {
+      if (sh->InfoLog) {
+         _mesa_problem(ctx,
+                       "meta program compile failed:\n%s\nsource:\n%s\n",
+                       sh->InfoLog, source);
+      }
 
-   info = malloc(size);
-   if (!info) {
-      _mesa_DeleteShader(shader);
-      return 0;
+      _mesa_reference_shader(ctx, &sh, NULL);
    }
 
-   _mesa_GetShaderInfoLog(shader, size, NULL, info);
-   _mesa_problem(ctx,
-		 "meta program compile failed:\n%s\n"
-		 "source:\n%s\n",
-		 info, source);
-
-   free(info);
-   _mesa_DeleteShader(shader);
-
-   return 0;
+   return sh;
 }
 
-GLuint
-_mesa_meta_link_program_with_debug(struct gl_context *ctx, GLuint program)
+void
+_mesa_meta_link_program_with_debug(struct gl_context *ctx,
+                                   struct gl_shader_program *sh_prog)
 {
-   GLint ok, size;
-   GLchar *info;
-
-   _mesa_LinkProgram(program);
-
-   _mesa_GetProgramiv(program, GL_LINK_STATUS, &ok);
-   if (ok)
-      return program;
+   _mesa_link_program(ctx, sh_prog);
 
-   _mesa_GetProgramiv(program, GL_INFO_LOG_LENGTH, &size);
-   if (size == 0)
-      return 0;
-
-   info = malloc(size);
-   if (!info)
-      return 0;
-
-   _mesa_GetProgramInfoLog(program, size, NULL, info);
-   _mesa_problem(ctx, "meta program link failed:\n%s", info);
+   if (!sh_prog->LinkStatus) {
+      _mesa_problem(ctx, "meta program link failed:\n%s", sh_prog->InfoLog);
+   }
+}
 
-   free(info);
+void
+_mesa_meta_use_program(struct gl_context *ctx,
+                       struct gl_shader_program *sh_prog)
+{
+   /* Attach shader state to the binding point */
+   _mesa_reference_pipeline_object(ctx, &ctx->_Shader, &ctx->Shader);
 
-   return 0;
+   /* Update the program */
+   _mesa_use_program(ctx, sh_prog);
 }
 
 void
@@ -194,22 +173,25 @@ _mesa_meta_compile_and_link_program(struct gl_context *ctx,
                                     const char *vs_source,
                                     const char *fs_source,
                                     const char *name,
-                                    GLuint *program)
+                                    struct gl_shader_program **out_sh_prog)
 {
-   GLuint vs = _mesa_meta_compile_shader_with_debug(ctx, GL_VERTEX_SHADER,
-                                                    vs_source);
-   GLuint fs = _mesa_meta_compile_shader_with_debug(ctx, GL_FRAGMENT_SHADER,
-                                                    fs_source);
-
-   *program = _mesa_CreateProgram();
-   _mesa_ObjectLabel(GL_PROGRAM, *program, -1, name);
-   _mesa_AttachShader(*program, fs);
-   _mesa_DeleteShader(fs);
-   _mesa_AttachShader(*program, vs);
-   _mesa_DeleteShader(vs);
-   _mesa_meta_link_program_with_debug(ctx, *program);
-
-   _mesa_UseProgram(*program);
+   struct gl_shader_program *sh_prog;
+   const GLuint id = ~0;
+
+   sh_prog = _mesa_new_shader_program(id);
+   sh_prog->Label = strdup(name);
+   sh_prog->NumShaders = 2;
+   sh_prog->Shaders = malloc(2 * sizeof(struct gl_shader *));
+   sh_prog->Shaders[0] =
+      _mesa_meta_compile_shader_with_debug(ctx, GL_VERTEX_SHADER, vs_source);
+   sh_prog->Shaders[1] =
+      _mesa_meta_compile_shader_with_debug(ctx, GL_FRAGMENT_SHADER, fs_source);
+
+   _mesa_meta_link_program_with_debug(ctx, sh_prog);
+
+   _mesa_meta_use_program(ctx, sh_prog);
+
+   *out_sh_prog = sh_prog;
 }
 
 /**
@@ -244,8 +226,8 @@ _mesa_meta_setup_blit_shader(struct gl_context *ctx,
 
    assert(shader != NULL);
 
-   if (shader->shader_prog != 0) {
-      _mesa_UseProgram(shader->shader_prog);
+   if (shader->shader_prog != NULL) {
+      _mesa_meta_use_program(ctx, shader->shader_prog);
       return;
    }
 
@@ -1528,7 +1510,6 @@ meta_glsl_clear_init(struct gl_context *ctx, struct clear_state *clear)
       "{\n"
       "   gl_FragColor = color;\n"
       "}\n";
-   GLuint vs, fs;
    bool has_integer_textures;
 
    _mesa_meta_setup_vertex_objects(ctx, &clear->VAO, &clear->buf_obj, true,
@@ -1592,12 +1573,10 @@ meta_glsl_clear_cleanup(struct gl_context *ctx, struct clear_state *clear)
    _mesa_DeleteVertexArrays(1, &clear->VAO);
    clear->VAO = 0;
    _mesa_reference_buffer_object(ctx, &clear->buf_obj, NULL);
-   _mesa_DeleteProgram(clear->ShaderProg);
-   clear->ShaderProg = 0;
+   _mesa_reference_shader_program(ctx, &clear->ShaderProg, NULL);
 
    if (clear->IntegerShaderProg) {
-      _mesa_DeleteProgram(clear->IntegerShaderProg);
-      clear->IntegerShaderProg = 0;
+      _mesa_reference_shader_program(ctx, &clear->IntegerShaderProg, NULL);
    }
 }
 
@@ -1711,10 +1690,10 @@ meta_clear(struct gl_context *ctx, GLbitfield buffers, bool glsl)
 
    if (fb->_IntegerColor) {
       assert(glsl);
-      _mesa_UseProgram(clear->IntegerShaderProg);
+      _mesa_meta_use_program(ctx, clear->IntegerShaderProg);
       _mesa_Uniform4iv(0, 1, ctx->Color.ClearColor.i);
    } else if (glsl) {
-      _mesa_UseProgram(clear->ShaderProg);
+      _mesa_meta_use_program(ctx, clear->ShaderProg);
       _mesa_Uniform4fv(0, 1, ctx->Color.ClearColor.f);
    }
 
@@ -2675,25 +2654,17 @@ choose_blit_shader(GLenum target, struct blit_shader_table *table)
 }
 
 void
-_mesa_meta_blit_shader_table_cleanup(struct blit_shader_table *table)
+_mesa_meta_blit_shader_table_cleanup(struct gl_context *ctx,
+                                     struct blit_shader_table *table)
 {
-   _mesa_DeleteProgram(table->sampler_1d.shader_prog);
-   _mesa_DeleteProgram(table->sampler_2d.shader_prog);
-   _mesa_DeleteProgram(table->sampler_3d.shader_prog);
-   _mesa_DeleteProgram(table->sampler_rect.shader_prog);
-   _mesa_DeleteProgram(table->sampler_cubemap.shader_prog);
-   _mesa_DeleteProgram(table->sampler_1d_array.shader_prog);
-   _mesa_DeleteProgram(table->sampler_2d_array.shader_prog);
-   _mesa_DeleteProgram(table->sampler_cubemap_array.shader_prog);
-
-   table->sampler_1d.shader_prog = 0;
-   table->sampler_2d.shader_prog = 0;
-   table->sampler_3d.shader_prog = 0;
-   table->sampler_rect.shader_prog = 0;
-   table->sampler_cubemap.shader_prog = 0;
-   table->sampler_1d_array.shader_prog = 0;
-   table->sampler_2d_array.shader_prog = 0;
-   table->sampler_cubemap_array.shader_prog = 0;
+   _mesa_reference_shader_program(ctx, &table->sampler_1d.shader_prog, NULL);
+   _mesa_reference_shader_program(ctx, &table->sampler_2d.shader_prog, NULL);
+   _mesa_reference_shader_program(ctx, &table->sampler_3d.shader_prog, NULL);
+   _mesa_reference_shader_program(ctx, &table->sampler_rect.shader_prog, NULL);
+   _mesa_reference_shader_program(ctx, &table->sampler_cubemap.shader_prog, NULL);
+   _mesa_reference_shader_program(ctx, &table->sampler_1d_array.shader_prog, NULL);
+   _mesa_reference_shader_program(ctx, &table->sampler_2d_array.shader_prog, NULL);
+   _mesa_reference_shader_program(ctx, &table->sampler_cubemap_array.shader_prog, NULL);
 }
 
 /**
diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h
index c2efa50a33d..0a7321c9d88 100644
--- a/src/mesa/drivers/common/meta.h
+++ b/src/mesa/drivers/common/meta.h
@@ -218,7 +218,7 @@ struct blit_shader {
    const char *type;
    const char *func;
    const char *texcoords;
-   GLuint shader_prog;
+   struct gl_shader_program *shader_prog;
 };
 
 /**
@@ -302,7 +302,7 @@ struct blit_state
    struct gl_buffer_object *buf_obj;
    struct blit_shader_table shaders_with_depth;
    struct blit_shader_table shaders_without_depth;
-   GLuint msaa_shaders[BLIT_MSAA_SHADER_COUNT];
+   struct gl_shader_program *msaa_shaders[BLIT_MSAA_SHADER_COUNT];
    struct temp_texture depthTex;
    bool no_ctsi_fallback;
 };
@@ -324,8 +324,8 @@ struct clear_state
 {
    GLuint VAO;
    struct gl_buffer_object *buf_obj;
-   GLuint ShaderProg;
-   GLuint IntegerShaderProg;
+   struct gl_shader_program *ShaderProg;
+   struct gl_shader_program *IntegerShaderProg;
 };
 
 
@@ -577,20 +577,25 @@ _mesa_meta_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
 void
 _mesa_meta_drawbuffers_from_bitfield(GLbitfield bits);
 
-GLuint
+struct gl_shader *
 _mesa_meta_compile_shader_with_debug(struct gl_context *ctx, GLenum target,
                                      const GLcharARB *source);
 
 
-GLuint
-_mesa_meta_link_program_with_debug(struct gl_context *ctx, GLuint program);
+void
+_mesa_meta_link_program_with_debug(struct gl_context *ctx,
+                                   struct gl_shader_program *sh_prog);
 
 void
 _mesa_meta_compile_and_link_program(struct gl_context *ctx,
                                     const char *vs_source,
                                     const char *fs_source,
                                     const char *name,
-                                    GLuint *program);
+                                    struct gl_shader_program **sh_prog_ptr);
+
+extern void
+_mesa_meta_use_program(struct gl_context *ctx,
+                       struct gl_shader_program *sh_prog);
 
 GLboolean
 _mesa_meta_alloc_texture(struct temp_texture *tex,
@@ -655,7 +660,8 @@ void
 _mesa_meta_glsl_blit_cleanup(struct gl_context *ctx, struct blit_state *blit);
 
 void
-_mesa_meta_blit_shader_table_cleanup(struct blit_shader_table *table);
+_mesa_meta_blit_shader_table_cleanup(struct gl_context *ctx,
+                                     struct blit_shader_table *table);
 
 void
 _mesa_meta_glsl_generate_mipmap_cleanup(struct gl_context *ctx,
diff --git a/src/mesa/drivers/common/meta_blit.c b/src/mesa/drivers/common/meta_blit.c
index 179dc0d8630..0066f7f9184 100644
--- a/src/mesa/drivers/common/meta_blit.c
+++ b/src/mesa/drivers/common/meta_blit.c
@@ -105,12 +105,12 @@ setup_glsl_msaa_blit_scaled_shader(struct gl_context *ctx,
    }
 
    if (blit->msaa_shaders[shader_index]) {
-      _mesa_UseProgram(blit->msaa_shaders[shader_index]);
+      _mesa_meta_use_program(ctx, blit->msaa_shaders[shader_index]);
       /* Update the uniform values. */
       loc_src_width =
-         _mesa_GetUniformLocation(blit->msaa_shaders[shader_index], "src_width");
+         _mesa_program_resource_location(blit->msaa_shaders[shader_index], GL_UNIFORM, "src_width");
       loc_src_height =
-         _mesa_GetUniformLocation(blit->msaa_shaders[shader_index], "src_height");
+         _mesa_program_resource_location(blit->msaa_shaders[shader_index], GL_UNIFORM, "src_height");
       _mesa_Uniform1f(loc_src_width, src_rb->Width);
       _mesa_Uniform1f(loc_src_height, src_rb->Height);
       return;
@@ -237,9 +237,9 @@ setup_glsl_msaa_blit_scaled_shader(struct gl_context *ctx,
    _mesa_meta_compile_and_link_program(ctx, vs_source, fs_source, name,
                                        &blit->msaa_shaders[shader_index]);
    loc_src_width =
-      _mesa_GetUniformLocation(blit->msaa_shaders[shader_index], "src_width");
+      _mesa_program_resource_location(blit->msaa_shaders[shader_index], GL_UNIFORM, "src_width");
    loc_src_height =
-      _mesa_GetUniformLocation(blit->msaa_shaders[shader_index], "src_height");
+      _mesa_program_resource_location(blit->msaa_shaders[shader_index], GL_UNIFORM, "src_height");
    _mesa_Uniform1f(loc_src_width, src_rb->Width);
    _mesa_Uniform1f(loc_src_height, src_rb->Height);
 
@@ -347,7 +347,7 @@ setup_glsl_msaa_blit_shader(struct gl_context *ctx,
    }
 
    if (blit->msaa_shaders[shader_index]) {
-      _mesa_UseProgram(blit->msaa_shaders[shader_index]);
+      _mesa_meta_use_program(ctx, blit->msaa_shaders[shader_index]);
       return;
    }
 
@@ -1037,8 +1037,8 @@ _mesa_meta_glsl_blit_cleanup(struct gl_context *ctx, struct blit_state *blit)
       _mesa_reference_buffer_object(ctx, &blit->buf_obj, NULL);
    }
 
-   _mesa_meta_blit_shader_table_cleanup(&blit->shaders_with_depth);
-   _mesa_meta_blit_shader_table_cleanup(&blit->shaders_without_depth);
+   _mesa_meta_blit_shader_table_cleanup(ctx, &blit->shaders_with_depth);
+   _mesa_meta_blit_shader_table_cleanup(ctx, &blit->shaders_without_depth);
 
    _mesa_DeleteTextures(1, &blit->depthTex.TexObj);
    blit->depthTex.TexObj = 0;
diff --git a/src/mesa/drivers/common/meta_generate_mipmap.c b/src/mesa/drivers/common/meta_generate_mipmap.c
index 892d8d34619..d4b75390ebf 100644
--- a/src/mesa/drivers/common/meta_generate_mipmap.c
+++ b/src/mesa/drivers/common/meta_generate_mipmap.c
@@ -134,7 +134,7 @@ _mesa_meta_glsl_generate_mipmap_cleanup(struct gl_context *ctx,
    _mesa_reference_sampler_object(ctx, &mipmap->samp_obj, NULL);
    _mesa_reference_framebuffer(&mipmap->fb, NULL);
 
-   _mesa_meta_blit_shader_table_cleanup(&mipmap->shaders);
+   _mesa_meta_blit_shader_table_cleanup(ctx, &mipmap->shaders);
 }
 
 static GLboolean
diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index a953745b114..b45ee5eb69d 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -900,7 +900,7 @@ struct brw_context
    struct brw_cache cache;
 
    /** IDs for meta stencil blit shader programs. */
-   unsigned meta_stencil_blit_programs[2];
+   struct gl_shader_program *meta_stencil_blit_programs[2];
 
    /* Whether a meta-operation is in progress. */
    bool meta_in_progress;
diff --git a/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c b/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
index e2882da403d..1fb5dc83885 100644
--- a/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
+++ b/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
@@ -26,6 +26,7 @@
 #include "main/context.h"
 #include "main/objectlabel.h"
 #include "main/shaderapi.h"
+#include "main/shaderobj.h"
 #include "main/arrayobj.h"
 #include "main/bufferobj.h"
 #include "main/buffers.h"
@@ -61,8 +62,8 @@
 struct brw_fast_clear_state {
    struct gl_buffer_object *buf_obj;
    struct gl_vertex_array_object *array_obj;
+   struct gl_shader_program *shader_prog;
    GLuint vao;
-   GLuint shader_prog;
    GLint color_location;
 };
 
@@ -131,7 +132,7 @@ brw_bind_rep_write_shader(struct brw_context *brw, float *color)
    struct gl_context *ctx = &brw->ctx;
 
    if (clear->shader_prog) {
-      _mesa_UseProgram(clear->shader_prog);
+      _mesa_meta_use_program(ctx, clear->shader_prog);
       _mesa_Uniform4fv(clear->color_location, 1, color);
       return;
    }
@@ -141,9 +142,9 @@ brw_bind_rep_write_shader(struct brw_context *brw, float *color)
                                        &clear->shader_prog);
 
    clear->color_location =
-      _mesa_GetUniformLocation(clear->shader_prog, "color");
+      _mesa_program_resource_location(clear->shader_prog, GL_UNIFORM, "color");
 
-   _mesa_UseProgram(clear->shader_prog);
+   _mesa_meta_use_program(ctx, clear->shader_prog);
    _mesa_Uniform4fv(clear->color_location, 1, color);
 }
 
@@ -160,7 +161,7 @@ brw_meta_fast_clear_free(struct brw_context *brw)
 
    _mesa_DeleteVertexArrays(1, &clear->vao);
    _mesa_reference_buffer_object(&brw->ctx, &clear->buf_obj, NULL);
-   _mesa_DeleteProgram(clear->shader_prog);
+   _mesa_reference_shader_program(&brw->ctx, &clear->shader_prog, NULL);
    free(clear);
 
    if (old_context)
diff --git a/src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c b/src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c
index 5b0c2e9bdd5..7e0424846a5 100644
--- a/src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c
+++ b/src/mesa/drivers/dri/i965/brw_meta_stencil_blit.c
@@ -193,6 +193,9 @@ static const char *fs_tmpl =
    "   %s;\n"
    "}\n";
 
+#define get_uniform_loc(sh_prog, name) \
+   _mesa_program_resource_location(sh_prog, GL_UNIFORM, name)
+
 /**
  * Setup uniforms telling the coordinates of the destination rectangle in the
  * native w-tiled space. These are needed to ignore pixels that lie outside.
@@ -201,12 +204,13 @@ static const char *fs_tmpl =
  * 16x2 y-tiled).
  */
 static void
-setup_bounding_rect(GLuint prog, const struct blit_dims *dims)
+setup_bounding_rect(struct gl_shader_program *sh_prog,
+                    const struct blit_dims *dims)
 {
-   _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_x0"), dims->dst_x0);
-   _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_x1"), dims->dst_x1);
-   _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_y0"), dims->dst_y0);
-   _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_y1"), dims->dst_y1);
+   _mesa_Uniform1i(get_uniform_loc(sh_prog, "dst_x0"), dims->dst_x0);
+   _mesa_Uniform1i(get_uniform_loc(sh_prog, "dst_x1"), dims->dst_x1);
+   _mesa_Uniform1i(get_uniform_loc(sh_prog, "dst_y0"), dims->dst_y0);
+   _mesa_Uniform1i(get_uniform_loc(sh_prog, "dst_y1"), dims->dst_y1);
 }
 
 /**
@@ -215,14 +219,15 @@ setup_bounding_rect(GLuint prog, const struct blit_dims *dims)
  * between destination and source that may have differing offsets.
  */
 static void
-setup_drawing_rect(GLuint prog, const struct blit_dims *dims)
+setup_drawing_rect(struct gl_shader_program *sh_prog,
+                   const struct blit_dims *dims)
 {
-   _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "draw_rect_w"),
+   _mesa_Uniform1f(get_uniform_loc(sh_prog, "draw_rect_w"),
                    dims->dst_x1 - dims->dst_x0);
-   _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "draw_rect_h"),
+   _mesa_Uniform1f(get_uniform_loc(sh_prog, "draw_rect_h"),
                    dims->dst_y1 - dims->dst_y0);
-   _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "dst_x_off"), dims->dst_x0);
-   _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "dst_y_off"), dims->dst_y0);
+   _mesa_Uniform1f(get_uniform_loc(sh_prog, "dst_x_off"), dims->dst_x0);
+   _mesa_Uniform1f(get_uniform_loc(sh_prog, "dst_y_off"), dims->dst_y0);
 }
 
 /**
@@ -241,7 +246,7 @@ setup_drawing_rect(GLuint prog, const struct blit_dims *dims)
  *   src_x = src_x0 + (dst_x1 -dst_x - 0.5) * scale
  */
 static void
-setup_coord_coeff(GLuint prog, GLuint multiplier, GLuint offset,
+setup_coord_coeff(GLuint multiplier, GLuint offset,
                   int src_0, int src_1, int dst_0, int dst_1, bool mirror)
 {
    const float scale = ((float)(src_1 - src_0)) / (dst_1 - dst_0);
@@ -265,22 +270,21 @@ setup_coord_coeff(GLuint prog, GLuint multiplier, GLuint offset,
  * destination rectangle is adjusted for possible msaa and Y-tiling.
  */
 static void
-setup_coord_transform(GLuint prog, const struct blit_dims *dims)
+setup_coord_transform(struct gl_shader_program *sh_prog,
+                      const struct blit_dims *dims)
 {
-   setup_coord_coeff(prog,
-                     _mesa_GetUniformLocation(prog, "src_x_scale"),
-                     _mesa_GetUniformLocation(prog, "src_x_off"),
+   setup_coord_coeff(get_uniform_loc(sh_prog, "src_x_scale"),
+                     get_uniform_loc(sh_prog, "src_x_off"),
                      dims->src_x0, dims->src_x1, dims->dst_x0, dims->dst_x1,
                      dims->mirror_x);
 
-   setup_coord_coeff(prog,
-                     _mesa_GetUniformLocation(prog, "src_y_scale"),
-                     _mesa_GetUniformLocation(prog, "src_y_off"),
+   setup_coord_coeff(get_uniform_loc(sh_prog, "src_y_scale"),
+                     get_uniform_loc(sh_prog, "src_y_off"),
                      dims->src_y0, dims->src_y1, dims->dst_y0, dims->dst_y1,
                      dims->mirror_y);
 }
 
-static GLuint
+static struct gl_shader_program *
 setup_program(struct brw_context *brw, bool msaa_tex)
 {
    struct gl_context *ctx = &brw->ctx;
@@ -291,21 +295,22 @@ setup_program(struct brw_context *brw, bool msaa_tex)
    _mesa_meta_setup_vertex_objects(&brw->ctx, &blit->VAO, &blit->buf_obj, true,
                                    2, 2, 0);
 
-   GLuint *prog_id = &brw->meta_stencil_blit_programs[msaa_tex];
+   struct gl_shader_program **sh_prog_p =
+      &brw->meta_stencil_blit_programs[msaa_tex];
 
-   if (*prog_id) {
-      _mesa_UseProgram(*prog_id);
-      return *prog_id;
+   if (*sh_prog_p) {
+      _mesa_meta_use_program(ctx, *sh_prog_p);
+      return *sh_prog_p;
    }
 
    fs_source = ralloc_asprintf(NULL, fs_tmpl, sampler->sampler,
                                sampler->fetch);
    _mesa_meta_compile_and_link_program(ctx, vs_source, fs_source,
                                        "i965 stencil blit",
-                                       prog_id);
+                                       sh_prog_p);
    ralloc_free(fs_source);
 
-   return *prog_id;
+   return *sh_prog_p;
 }
 
 /**
@@ -425,7 +430,7 @@ brw_meta_stencil_blit(struct brw_context *brw,
    struct gl_context *ctx = &brw->ctx;
    struct blit_dims dims = *orig_dims;
    struct fb_tex_blit_state blit;
-   GLuint prog;
+   struct gl_shader_program *prog;
    struct gl_framebuffer *drawFb = NULL;
    struct gl_renderbuffer *rb = NULL;
    GLenum target;
@@ -467,7 +472,7 @@ brw_meta_stencil_blit(struct brw_context *brw,
    setup_drawing_rect(prog, &dims);
    setup_coord_transform(prog, orig_dims);
 
-   _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_num_samples"),
+   _mesa_Uniform1i(get_uniform_loc(prog, "dst_num_samples"),
                    dst_mt->num_samples);
 
    prepare_vertex_data(ctx, ctx->Meta->Blit.buf_obj);