intel: Add spans code for the ARB_texture_rg support.

This starts spantmp2.h down the path of using MESA_FORMAT_* for
specifying the format instead of the crazy GL format/type combo.

1 files changed, 122 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/common/spantmp2.h b/src/mesa/drivers/dri/common/spantmp2.h
index abd79562f98..f436d1398c2 100644
--- a/src/mesa/drivers/dri/common/spantmp2.h
+++ b/src/mesa/drivers/dri/common/spantmp2.h
@@ -48,6 +48,15 @@
 #define HW_WRITE_CLIPLOOP()	HW_CLIPLOOP()
 #endif
 
+#ifdef SPANTMP_MESA_FMT
+#define SPANTMP_PIXEL_FMT GL_NONE
+#define SPANTMP_PIXEL_TYPE GL_NONE
+#endif
+
+#ifndef SPANTMP_MESA_FMT
+#define SPANTMP_MESA_FMT MESA_FORMAT_COUNT
+#endif
+
 #if (SPANTMP_PIXEL_FMT == GL_RGB)  && (SPANTMP_PIXEL_TYPE == GL_UNSIGNED_SHORT_5_6_5)
 
 /**
@@ -445,6 +454,118 @@
 	rgba[3] = p;							\
      } while (0)
 
+#elif (SPANTMP_MESA_FMT == MESA_FORMAT_R8)
+
+#ifndef GET_VALUE
+#ifndef GET_PTR
+#define GET_PTR(_x, _y) (     buf + (_x) + (_y) * pitch)
+#endif
+
+#define GET_VALUE(_x, _y) *(volatile GLubyte *)(GET_PTR(_x, _y))
+#define PUT_VALUE(_x, _y, _v) *(volatile GLubyte *)(GET_PTR(_x, _y)) = (_v)
+#endif /* GET_VALUE */
+
+# define INIT_MONO_PIXEL(p, color)                       \
+     p = color[0]
+
+# define WRITE_RGBA(_x, _y, r, g, b, a)                                 \
+   PUT_VALUE(_x, _y, r)
+
+#define WRITE_PIXEL(_x, _y, p) PUT_VALUE(_x, _y, p)
+
+#define READ_RGBA( rgba, _x, _y )				        \
+     do {								\
+        GLubyte p = GET_VALUE(_x, _y);					\
+	rgba[0] = p;							\
+	rgba[1] = 0;							\
+	rgba[2] = 0;							\
+	rgba[3] = 0;							\
+     } while (0)
+
+#elif (SPANTMP_MESA_FMT == MESA_FORMAT_RG88)
+
+#ifndef GET_VALUE
+#ifndef GET_PTR
+#define GET_PTR(_x, _y) (     buf + (_x) * 2 + (_y) * pitch)
+#endif
+
+#define GET_VALUE(_x, _y) *(volatile GLushort *)(GET_PTR(_x, _y))
+#define PUT_VALUE(_x, _y, _v) *(volatile GLushort *)(GET_PTR(_x, _y)) = (_v)
+#endif /* GET_VALUE */
+
+# define INIT_MONO_PIXEL(p, color)                       \
+   PACK_COLOR_8888(color[0], color[1], 0, 0)
+
+# define WRITE_RGBA(_x, _y, r, g, b, a)                                 \
+   PUT_VALUE(_x, _y, r)
+
+#define WRITE_PIXEL(_x, _y, p) PUT_VALUE(_x, _y, p)
+
+#define READ_RGBA( rgba, _x, _y )				        \
+     do {								\
+        GLushort p = GET_VALUE(_x, _y);					\
+	rgba[0] = p & 0xff;						\
+	rgba[1] = (p >> 8) & 0xff;					\
+	rgba[2] = 0;							\
+	rgba[3] = 0;							\
+     } while (0)
+
+#elif (SPANTMP_MESA_FMT == MESA_FORMAT_R16)
+
+#ifndef GET_VALUE
+#ifndef GET_PTR
+#define GET_PTR(_x, _y) (     buf + (_x) * 2 + (_y) * pitch)
+#endif
+
+#define GET_VALUE(_x, _y) *(volatile GLushort *)(GET_PTR(_x, _y))
+#define PUT_VALUE(_x, _y, _v) *(volatile GLushort *)(GET_PTR(_x, _y)) = (_v)
+#endif /* GET_VALUE */
+
+# define INIT_MONO_PIXEL(p, color)                       \
+     p = color[0]
+
+# define WRITE_RGBA(_x, _y, r, g, b, a)                                 \
+   PUT_VALUE(_x, _y, r)
+
+#define WRITE_PIXEL(_x, _y, p) PUT_VALUE(_x, _y, p)
+
+#define READ_RGBA( rgba, _x, _y )				        \
+     do {								\
+        GLushort p = GET_VALUE(_x, _y);					\
+	rgba[0] = p;							\
+	rgba[1] = 0;							\
+	rgba[2] = 0;							\
+	rgba[3] = 0;							\
+     } while (0)
+
+#elif (SPANTMP_MESA_FMT == MESA_FORMAT_RG1616)
+
+#ifndef GET_VALUE
+#ifndef GET_PTR
+#define GET_PTR(_x, _y) (     buf + (_x) * 4 + (_y) * pitch)
+#endif
+
+#define GET_VALUE(_x, _y) *(volatile GLuint *)(GET_PTR(_x, _y))
+#define PUT_VALUE(_x, _y, _v) *(volatile GLuint *)(GET_PTR(_x, _y)) = (_v)
+#endif /* GET_VALUE */
+
+# define INIT_MONO_PIXEL(p, color)                       \
+   ((color[1] << 16) | (color[0]))
+
+# define WRITE_RGBA(_x, _y, r, g, b, a)                                 \
+   PUT_VALUE(_x, _y, r)
+
+#define WRITE_PIXEL(_x, _y, p) PUT_VALUE(_x, _y, p)
+
+#define READ_RGBA( rgba, _x, _y )				        \
+     do {								\
+        GLuint p = GET_VALUE(_x, _y);					\
+	rgba[0] = p & 0xffff;						\
+	rgba[1] = (p >> 16) & 0xffff;					\
+	rgba[2] = 0;							\
+	rgba[3] = 0;							\
+     } while (0)
+
 #else
 #error SPANTMP_PIXEL_FMT must be set to a valid value!
 #endif
@@ -914,3 +1035,4 @@ static void TAG(InitPointers)(struct gl_renderbuffer *rb)
 #undef GET_PTR
 #undef SPANTMP_PIXEL_FMT
 #undef SPANTMP_PIXEL_TYPE
+#undef SPANTMP_MESA_FMT