[Mesa-stable] [PATCH] mesa: support GL_RED/GL_RG in ES2 contexts when driver support exists

[Ilia Mirkin]

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93126
Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Cc: "11.0 11.1" <mesa-stable at lists.freedesktop.org>
---
 src/mesa/main/glformats.c | 8 +++++++-
 src/mesa/main/glformats.h | 3 ++-
 src/mesa/main/readpix.c   | 2 +-
 src/mesa/main/teximage.c  | 2 +-
 4 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/mesa/main/glformats.c b/src/mesa/main/glformats.c
index 2ed42ea..7b264eb 100644
--- a/src/mesa/main/glformats.c
+++ b/src/mesa/main/glformats.c
@@ -2077,12 +2077,18 @@ _mesa_error_check_format_and_type(const struct gl_context *ctx,
  * \return error code, or GL_NO_ERROR.
  */
 GLenum
-_mesa_es_error_check_format_and_type(GLenum format, GLenum type,
+_mesa_es_error_check_format_and_type(const struct gl_context *ctx,
+                                     GLenum format, GLenum type,
                                      unsigned dimensions)
 {
    GLboolean type_valid = GL_TRUE;
 
    switch (format) {
+   case GL_RED:
+   case GL_RG:
+      if (!ctx->Extensions.ARB_texture_rg)
+         return GL_INVALID_VALUE;
+      /* fallthrough */
    case GL_ALPHA:
    case GL_LUMINANCE:
    case GL_LUMINANCE_ALPHA:
diff --git a/src/mesa/main/glformats.h b/src/mesa/main/glformats.h
index 92f4bc6..b366855 100644
--- a/src/mesa/main/glformats.h
+++ b/src/mesa/main/glformats.h
@@ -127,7 +127,8 @@ _mesa_error_check_format_and_type(const struct gl_context *ctx,
                                   GLenum format, GLenum type);
 
 extern GLenum
-_mesa_es_error_check_format_and_type(GLenum format, GLenum type,
+_mesa_es_error_check_format_and_type(const struct gl_context *ctx,
+                                     GLenum format, GLenum type,
                                      unsigned dimensions);
 
 extern GLenum
diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index 81bb912..8cdc9fe 100644
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -1043,7 +1043,7 @@ _mesa_ReadnPixelsARB( GLint x, GLint y, GLsizei width, GLsizei height,
           _mesa_get_color_read_type(ctx) == type) {
          err = GL_NO_ERROR;
       } else if (ctx->Version < 30) {
-         err = _mesa_es_error_check_format_and_type(format, type, 2);
+         err = _mesa_es_error_check_format_and_type(ctx, format, type, 2);
          if (err == GL_NO_ERROR) {
             if (type == GL_FLOAT || type == GL_HALF_FLOAT_OES) {
                err = GL_INVALID_OPERATION;
diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index ac7599f..37dbe26 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -1699,7 +1699,7 @@ texture_format_error_check_gles(struct gl_context *ctx, GLenum format,
       }
    }
    else {
-      err = _mesa_es_error_check_format_and_type(format, type, dimensions);
+      err = _mesa_es_error_check_format_and_type(ctx, format, type, dimensions);
       if (err != GL_NO_ERROR) {
          _mesa_error(ctx, err, "%s(format = %s, type = %s)",
                      callerName, _mesa_enum_to_string(format),
-- 
2.4.10