mesa: add support for GL_OES_compressed_ETC1_RGB8_texture

Add support for GL_OES_compressed_ETC1_RGB8_texture to core mesa.  There is no
driver support yet.

Unlike desktop GL compressed texture formats, GLES compressed texture formats
usually can only be used with glCompressedTexImage2D.  All other gl*Tex*Image*
functions are updated to check for that.

Reviewed-by: Brian Paul <[email protected]>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/mesa/main/texcompress.c b/src/mesa/main/texcompress.c
index 0458b9b689e..5045aef06cc 100644
--- a/src/mesa/main/texcompress.c
+++ b/src/mesa/main/texcompress.c
@@ -40,6 +40,7 @@
 #include "texcompress_fxt1.h"
 #include "texcompress_rgtc.h"
 #include "texcompress_s3tc.h"
+#include "texcompress_etc.h"
 #include "swrast/s_context.h"
 
 
@@ -90,6 +91,7 @@ _mesa_gl_compressed_format_base_format(GLenum format)
    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
    case GL_COMPRESSED_RGB_FXT1_3DFX:
    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+   case GL_ETC1_RGB8_OES:
       return GL_RGB;
 
    case GL_COMPRESSED_RGBA:
@@ -264,6 +266,15 @@ _mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats)
       }
    }
 
+   if (ctx->Extensions.OES_compressed_ETC1_RGB8_texture) {
+      if (formats) {
+         formats[n++] = GL_ETC1_RGB8_OES;
+      }
+      else {
+         n += 1;
+      }
+   }
+
 #if FEATURE_ES1
    if (ctx->API == API_OPENGLES) {
       if (formats) {
@@ -341,6 +352,9 @@ _mesa_glenum_to_compressed_format(GLenum format)
    case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
       return MESA_FORMAT_SIGNED_LA_LATC2;
 
+   case GL_ETC1_RGB8_OES:
+      return MESA_FORMAT_ETC1_RGB8;
+
    default:
       return MESA_FORMAT_NONE;
    }
@@ -406,6 +420,9 @@ _mesa_compressed_format_to_glenum(struct gl_context *ctx, GLuint mesaFormat)
    case MESA_FORMAT_SIGNED_LA_LATC2:
       return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT;
 
+   case MESA_FORMAT_ETC1_RGB8:
+      return GL_ETC1_RGB8_OES;
+
    default:
       _mesa_problem(ctx, "Unexpected mesa texture format in"
                     " _mesa_compressed_format_to_glenum()");
@@ -515,6 +532,11 @@ _mesa_decompress_image(gl_format format, GLuint width, GLuint height,
       fetch = _mesa_fetch_texel_2d_f_signed_la_latc2;
       break;
 
+   /* ETC1 formats */
+   case MESA_FORMAT_ETC1_RGB8:
+      fetch = _mesa_fetch_texel_2d_f_etc1_rgb8;
+      break;
+
    default:
       _mesa_problem(NULL, "Unexpected format in _mesa_decompress_image()");
       return;