[Mesa-dev] [PATCH 04/10] mesa: Add renderbuffer accessors for MESA_FORMAT_R_FLOAT32, RG_FLOAT32.

[Eric Anholt]

---
 src/mesa/main/renderbuffer.c |   92 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 92 insertions(+), 0 deletions(-)

diff --git a/src/mesa/main/renderbuffer.c b/src/mesa/main/renderbuffer.c
index a255ddd..7826e44 100644
--- a/src/mesa/main/renderbuffer.c
+++ b/src/mesa/main/renderbuffer.c
@@ -1113,6 +1113,78 @@ get_values_rg1616(struct gl_context *ctx, struct gl_renderbuffer *rb,
    }
 }
 
+/**********************************************************************
+ * Functions for MESA_FORMAT_R_FLOAT32.
+ */
+static void
+get_row_r_float32(struct gl_context *ctx, struct gl_renderbuffer *rb,
+		  GLuint count, GLint x, GLint y, void *values)
+{
+   const GLfloat *src = rb->GetPointer(ctx, rb, x, y);
+   GLfloat *dst = values;
+   GLuint i;
+
+   for (i = 0; i < count; i++) {
+      dst[i * 4 + RCOMP] = src[i];
+      dst[i * 4 + GCOMP] = 0.0;
+      dst[i * 4 + BCOMP] = 0.0;
+      dst[i * 4 + ACOMP] = 1.0;
+   }
+}
+
+static void
+get_values_r_float32(struct gl_context *ctx, struct gl_renderbuffer *rb,
+		     GLuint count, const GLint x[], const GLint y[],
+		     void *values)
+{
+   GLfloat *dst = values;
+   GLuint i;
+
+   for (i = 0; i < count; i++) {
+      const GLfloat *src = rb->GetPointer(ctx, rb, x[i], y[i]);
+      dst[i * 4 + RCOMP] = src[0];
+      dst[i * 4 + GCOMP] = 0.0;
+      dst[i * 4 + BCOMP] = 0.0;
+      dst[i * 4 + ACOMP] = 1.0;
+   }
+}
+
+/**********************************************************************
+ * Functions for MESA_FORMAT_RG_FLOAT32.
+ */
+static void
+get_row_rg_float32(struct gl_context *ctx, struct gl_renderbuffer *rb,
+		   GLuint count, GLint x, GLint y, void *values)
+{
+   const GLfloat *src = rb->GetPointer(ctx, rb, x, y);
+   GLfloat *dst = values;
+   GLuint i;
+
+   for (i = 0; i < count; i++) {
+      dst[i * 4 + RCOMP] = src[i * 2 + 0];
+      dst[i * 4 + GCOMP] = src[i * 2 + 1];
+      dst[i * 4 + BCOMP] = 0.0;
+      dst[i * 4 + ACOMP] = 1.0;
+   }
+}
+
+static void
+get_values_rg_float32(struct gl_context *ctx, struct gl_renderbuffer *rb,
+		      GLuint count, const GLint x[], const GLint y[],
+		      void *values)
+{
+   GLfloat *dst = values;
+   GLuint i;
+
+   for (i = 0; i < count; i++) {
+      const GLfloat *src = rb->GetPointer(ctx, rb, x[i], y[i]);
+      dst[i * 4 + RCOMP] = src[0];
+      dst[i * 4 + GCOMP] = src[1];
+      dst[i * 4 + BCOMP] = 0.0;
+      dst[i * 4 + ACOMP] = 1.0;
+   }
+}
+
 /**
  * This is the default software fallback for gl_renderbuffer's span
  * access functions.
@@ -1269,6 +1341,26 @@ _mesa_set_renderbuffer_accessors(struct gl_renderbuffer *rb)
       rb->PutValues = put_values_generic;
       rb->PutMonoValues = put_mono_values_generic;
       break;
+
+   case MESA_FORMAT_RG_FLOAT32:
+      rb->GetRow = get_row_rg_float32;
+      rb->GetValues = get_values_rg_float32;
+      rb->PutRow = put_row_generic;
+      rb->PutRowRGB = NULL;
+      rb->PutMonoRow = put_mono_row_generic;
+      rb->PutValues = put_values_generic;
+      rb->PutMonoValues = put_mono_values_generic;
+      break;
+
+   case MESA_FORMAT_R_FLOAT32:
+      rb->GetRow = get_row_r_float32;
+      rb->GetValues = get_values_r_float32;
+      rb->PutRow = put_row_generic;
+      rb->PutRowRGB = NULL;
+      rb->PutMonoRow = put_mono_row_generic;
+      rb->PutValues = put_values_generic;
+      rb->PutMonoValues = put_mono_values_generic;
+      break;
 #endif
 
    default:
-- 
1.7.4.4