Upload matrix state

1 files changed, 32 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/glamo/glamo_context.c b/src/mesa/drivers/dri/glamo/glamo_context.c
index 5f435028b7..47241ae9b8 100644
--- a/src/mesa/drivers/dri/glamo/glamo_context.c
+++ b/src/mesa/drivers/dri/glamo/glamo_context.c
@@ -326,3 +326,35 @@ GLboolean glamoUnbindContext(__DRIcontext *driContextPriv)
 {
 	return GL_TRUE;
 }
+
+
+/* Convert IEEE754 32-bit float to Glamo's signed 24-bit float */
+uint32_t float7s16(GLfloat in)
+{
+	uint32_t a, b;
+	uint32_t sign, expo, mant;  /* Sign, exponent, significand */
+
+	a = *(uint32_t *)∈
+
+	/* This is bad */
+	if ( a & 0x40000000 ) {
+		printf(stderr, "Warning: Exponent won't fit into 7 bits\n");
+	}
+
+	/* This hopefully isn't a big problem */
+	if ( a & 0x0000007f ) {
+		printf(stderr, "Warning: Precision lost in FP conversion\n");
+	}
+
+	/* Separate out the right bits */
+	mant = a & 0x007fff80;  /* Bits 7-22 (bits 0-6 are lost) */
+	expo = a & 0x3f800000;  /* Bits 23-29 (bit 30 is lost) */
+	sign = a & 0x80000000;  /* Bit 31 */
+
+	/* Shift and recombine */
+	b  = sign >> 8;  /* Fills bit 23 */
+	b |= expo >> 7;  /* Fills bits 16-22 */
+	b |= mant >> 7;  /* Fills bits 0-15 */
+
+	return b;
+}