mesa: add packing for int/uint

This just adds a simple packing for GL_UNSIGNED_INT/GL_INT destination formats.
This is enough for at least the gallium drivers to pack both unsigned and signed types for read pixels.

Signed-off-by: Dave Airlie <airlied@redhat.com>

src/mesa/main/pack.c

@@ -467,6 +467,69 @@ get_type_min_max(GLenum type, GLfloat *min, GLfloat *max)
    }
 }
 
+/*
+ * integer packing , no transfer operations only packs
+ * to dst of GL_UNSIGNED_INT or GL_INT
+ */
+void
+_mesa_pack_rgba_span_int(struct gl_context *ctx, GLuint n, GLuint rgba[][4],
+                         GLenum dstFormat, GLenum dstType,
+                         GLvoid *dstAddr)
+{
+   int i;
+
+   switch(dstType) {
+   case GL_UNSIGNED_INT: {
+      GLuint *dst = (GLuint *) dstAddr;
+      switch (dstFormat) {
+      case GL_RED_INTEGER_EXT:
+      case GL_GREEN_INTEGER_EXT:
+      case GL_BLUE_INTEGER_EXT:
+      case GL_ALPHA_INTEGER_EXT:
+      case GL_RGB_INTEGER_EXT:
+      case GL_RGBA_INTEGER_EXT:
+      case GL_BGR_INTEGER_EXT:
+      case GL_BGRA_INTEGER_EXT:
+      case GL_LUMINANCE_INTEGER_EXT:
+      case GL_LUMINANCE_ALPHA_INTEGER_EXT:
+         for (i=0;i<n;i++) {
+            dst[i*4+0] = (GLuint) rgba[i][RCOMP];
+            dst[i*4+1] = (GLuint) rgba[i][GCOMP];
+            dst[i*4+2] = (GLuint) rgba[i][BCOMP];
+            dst[i*4+3] = (GLuint) rgba[i][ACOMP];
+         }
+         break;
+      }
+   }
+      break;
+   case GL_INT: {
+      GLint *dst = (GLint *) dstAddr;
+      switch (dstFormat) {
+      case GL_RED_INTEGER_EXT:
+      case GL_GREEN_INTEGER_EXT:
+      case GL_BLUE_INTEGER_EXT:
+      case GL_ALPHA_INTEGER_EXT:
+      case GL_RGB_INTEGER_EXT:
+      case GL_RGBA_INTEGER_EXT:
+      case GL_BGR_INTEGER_EXT:
+      case GL_BGRA_INTEGER_EXT:
+      case GL_LUMINANCE_INTEGER_EXT:
+      case GL_LUMINANCE_ALPHA_INTEGER_EXT:
+         for (i=0;i<n;i++) {
+            dst[i*4+0] = (GLint) rgba[i][RCOMP];
+            dst[i*4+1] = (GLint) rgba[i][GCOMP];
+            dst[i*4+2] = (GLint) rgba[i][BCOMP];
+            dst[i*4+3] = (GLint) rgba[i][ACOMP];
+         }
+         break;
+      }
+   }
+      break;
+   default:
+      assert(0);
+      return;
+   }
+}
 
 
 /**

src/mesa/main/pack.h

@@ -144,4 +144,9 @@ _mesa_unpack_image(GLuint dimensions,
                    const struct gl_pixelstore_attrib *unpack);
 
 
+void
+_mesa_pack_rgba_span_int(struct gl_context *ctx, GLuint n, GLuint rgba[][4],
+                         GLenum dstFormat, GLenum dstType,
+                         GLvoid *dstAddr);
+
 #endif