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-rw-r--r--src/mesa/drivers/osmesa/osmesa.c215
1 files changed, 212 insertions, 3 deletions
diff --git a/src/mesa/drivers/osmesa/osmesa.c b/src/mesa/drivers/osmesa/osmesa.c
index 6cea55f78e..b93683ae2a 100644
--- a/src/mesa/drivers/osmesa/osmesa.c
+++ b/src/mesa/drivers/osmesa/osmesa.c
@@ -1,4 +1,4 @@
-/* $Id: osmesa.c,v 1.58 2001/06/15 13:41:12 brianp Exp $ */
+/* $Id: osmesa.c,v 1.59 2001/06/27 13:56:17 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -251,6 +251,22 @@ OSMesaCreateContextExt( GLenum format, GLint depthBits, GLint stencilBits,
rgbmode = GL_TRUE;
swalpha = GL_TRUE;
}
+ else if (format==OSMESA_RGB_565) {
+ indexBits = 0;
+ redBits = 5;
+ greenBits = 6;
+ blueBits = 5;
+ alphaBits = 0;
+ rshift = 11;
+ gshift = 5;
+ bshift = 0;
+ ashift = 0;
+ rind = 0; /* not used */
+ gind = 0;
+ bind = 0;
+ rgbmode = GL_TRUE;
+ swalpha = GL_FALSE;
+ }
else {
return NULL;
}
@@ -377,6 +393,10 @@ static void compute_row_addresses( OSMesaContext ctx )
/* RGB mode */
bytesPerPixel = 3 * sizeof(GLchan);
}
+ else if (ctx->format == OSMESA_RGB_565) {
+ /* 5/6/5 RGB pixel in 16 bits */
+ bytesPerPixel = 2;
+ }
else {
/* RGBA mode */
bytesPerPixel = 4 * sizeof(GLchan);
@@ -421,7 +441,7 @@ static void compute_row_addresses( OSMesaContext ctx )
* Input: ctx - the rendering context
* buffer - the image buffer memory
* type - data type for pixel components, only GL_UNSIGNED_BYTE
- * supported now
+ * and GL_UNSIGNED_SHORT_5_6_5 supported now.
* width, height - size of image buffer in pixels, at least 1
* Return: GL_TRUE if success, GL_FALSE if error because of invalid ctx,
* invalid buffer address, type!=GL_UNSIGNED_BYTE, width<1, height<1,
@@ -431,12 +451,19 @@ GLboolean GLAPIENTRY
OSMesaMakeCurrent( OSMesaContext ctx, void *buffer, GLenum type,
GLsizei width, GLsizei height )
{
- if (!ctx || !buffer || type != CHAN_TYPE ||
+ if (!ctx || !buffer ||
width < 1 || height < 1 ||
width > MAX_WIDTH || height > MAX_HEIGHT) {
return GL_FALSE;
}
+ if (ctx->format == OSMESA_RGB_565 && type != GL_UNSIGNED_SHORT_5_6_5) {
+ return GL_FALSE;
+ }
+ else if (type != CHAN_TYPE) {
+ return GL_FALSE;
+ }
+
osmesa_update_state( &ctx->gl_ctx, 0 );
_mesa_make_current( &ctx->gl_ctx, ctx->gl_buffer );
@@ -619,6 +646,11 @@ do { \
(DST)[2] = R; \
} while (0)
+#define PACK_RGB_565(DST, R, G, B) \
+do { \
+ (DST) = (((R) << 8) & 0xf800) | (((G) << 3) & 0x7e0) | ((B) >> 3);\
+} while (0)
+
#define UNPACK_RED(P) ( (P)[osmesa->rInd] )
#define UNPACK_GREEN(P) ( (P)[osmesa->gInd] )
@@ -627,6 +659,7 @@ do { \
#define PIXELADDR1(X,Y) (osmesa->rowaddr[Y] + (X))
+#define PIXELADDR2(X,Y) (osmesa->rowaddr[Y] + 2 * (X))
#define PIXELADDR3(X,Y) (osmesa->rowaddr[Y] + 3 * (X))
#define PIXELADDR4(X,Y) (osmesa->rowaddr[Y] + 4 * (X))
@@ -741,6 +774,34 @@ static void clear( GLcontext *ctx, GLbitfield mask, GLboolean all,
}
}
}
+ else if (osmesa->format == OSMESA_RGB_565) {
+ const GLchan r = ctx->Color.ClearColor[0];
+ const GLchan g = ctx->Color.ClearColor[1];
+ const GLchan b = ctx->Color.ClearColor[2];
+ GLushort clearPixel;
+ PACK_RGB_565(clearPixel, r, g, b);
+ if (all) {
+ /* Clear whole RGB buffer */
+ const GLint n = osmesa->rowlength * osmesa->height;
+ GLushort *ptr2 = (GLushort *) osmesa->buffer;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ *ptr2 = clearPixel;
+ ptr2++;
+ }
+ }
+ else {
+ /* clear scissored region */
+ GLint i, j;
+ for (i = 0; i < height; i++) {
+ GLushort *ptr2 = (GLushort *) PIXELADDR2(x, (y + i));
+ for (j = 0; j < width; j++) {
+ *ptr2 = clearPixel;
+ ptr2++;
+ }
+ }
+ }
+ }
else {
#if CHAN_TYPE == GL_UNSIGNED_BYTE
/* 4-byte pixel value */
@@ -1208,6 +1269,145 @@ read_rgba_pixels3( const GLcontext *ctx,
/**********************************************************************/
+/***** 2 byte RGB pixel support funcs *****/
+/**********************************************************************/
+
+/* Write RGBA pixels to an RGB_565 buffer. */
+static void
+write_rgba_span2( const GLcontext *ctx,
+ GLuint n, GLint x, GLint y,
+ CONST GLubyte rgba[][4], const GLubyte mask[] )
+{
+ OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
+ GLushort *ptr2 = (GLushort *) PIXELADDR2(x, y);
+ GLuint i;
+ if (mask) {
+ for (i = 0; i < n; i++, ptr2++) {
+ if (mask[i]) {
+ PACK_RGB_565(*ptr2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+ }
+ }
+ }
+ else {
+ for (i = 0; i < n; i++, ptr2++) {
+ PACK_RGB_565(*ptr2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+ }
+ }
+}
+
+
+/* Write RGB pixels to an RGB_565 buffer. */
+static void
+write_rgb_span2( const GLcontext *ctx,
+ GLuint n, GLint x, GLint y,
+ CONST GLubyte rgb[][3], const GLubyte mask[] )
+{
+ OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
+ GLushort *ptr2 = (GLushort *) PIXELADDR2(x, y);
+ GLuint i;
+ if (mask) {
+ for (i = 0; i < n; i++, ptr2++) {
+ if (mask[i]) {
+ PACK_RGB_565(*ptr2, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+ }
+ }
+ }
+ else {
+ for (i = 0; i < n; i++, ptr2++) {
+ PACK_RGB_565(*ptr2, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+ }
+ }
+}
+
+
+static void
+write_monocolor_span2( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+ const GLchan color[4], const GLubyte mask[] )
+{
+ OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
+ GLushort pixel;
+ GLushort *ptr2 = (GLushort *) PIXELADDR2(x, y);
+ GLuint i;
+ PACK_RGB_565(pixel, color[RCOMP], color[GCOMP], color[BCOMP]);
+ for (i = 0; i < n; i++, ptr2++) {
+ if (mask[i]) {
+ *ptr2 = pixel;
+ }
+ }
+}
+
+
+static void
+write_rgba_pixels2( const GLcontext *ctx,
+ GLuint n, const GLint x[], const GLint y[],
+ CONST GLubyte rgba[][4], const GLubyte mask[] )
+{
+ OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ GLushort *ptr2 = (GLushort *) PIXELADDR2(x[i],y[i]);
+ PACK_RGB_565(*ptr2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+ }
+ }
+}
+
+static void
+write_monocolor_pixels2( const GLcontext *ctx,
+ GLuint n, const GLint x[], const GLint y[],
+ const GLchan color[4], const GLubyte mask[] )
+{
+ OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
+ GLuint i;
+ GLushort pixel;
+ PACK_RGB_565(pixel, color[RCOMP], color[GCOMP], color[BCOMP]);
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ GLushort *ptr2 = (GLushort *) PIXELADDR2(x[i],y[i]);
+ *ptr2 = pixel;
+ }
+ }
+}
+
+static void
+read_rgba_span2( const GLcontext *ctx,
+ GLuint n, GLint x, GLint y,
+ GLubyte rgba[][4] )
+{
+ OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
+ GLuint i;
+ const GLushort *ptr2 = (const GLushort *) PIXELADDR2(x, y);
+ for (i = 0; i < n; i++, ptr2++) {
+ /* This should be fixed to get the low bits right */
+ rgba[i][RCOMP] = (*ptr2 >> 8) & 0xFe;
+ rgba[i][GCOMP] = (*ptr2 >> 3) & 0xFc;
+ rgba[i][BCOMP] = (*ptr2 << 3) & 0xFe;
+ rgba[i][ACOMP] = 0;
+ }
+}
+
+static void
+read_rgba_pixels2( const GLcontext *ctx,
+ GLuint n, const GLint x[], const GLint y[],
+ GLubyte rgba[][4], const GLubyte mask[] )
+{
+ OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ /* This should be fixed to get the low bits right */
+ const GLushort *ptr2 = (const GLushort *) PIXELADDR2(x[i],y[i]);
+ rgba[i][RCOMP] = (*ptr2 >> 8) & 0xFE;
+ rgba[i][GCOMP] = (*ptr2 >> 3) & 0xFC;
+ rgba[i][BCOMP] = (*ptr2 << 3) & 0xFE;
+ rgba[i][ACOMP] = 0;
+ }
+ }
+}
+
+
+
+/**********************************************************************/
/***** Read/write spans/arrays of CI pixels *****/
/**********************************************************************/
@@ -1830,6 +2030,15 @@ static void osmesa_update_state( GLcontext *ctx, GLuint new_state )
swdd->ReadRGBASpan = read_rgba_span3;
swdd->ReadRGBAPixels = read_rgba_pixels3;
}
+ else if (osmesa->format == OSMESA_RGB_565) {
+ swdd->WriteRGBASpan = write_rgba_span2;
+ swdd->WriteRGBSpan = write_rgb_span2;
+ swdd->WriteMonoRGBASpan = write_monocolor_span2;
+ swdd->WriteRGBAPixels = write_rgba_pixels2;
+ swdd->WriteMonoRGBAPixels = write_monocolor_pixels2;
+ swdd->ReadRGBASpan = read_rgba_span2;
+ swdd->ReadRGBAPixels = read_rgba_pixels2;
+ }
else {
/* 4 GLchan / pixel in frame buffer */
swdd->WriteRGBSpan = write_rgb_span;