* Also, routines for reading/writing software-based renderbuffer data as
* ubytes, ushorts, uints, etc.
*
- * The 'alpha8' renderbuffer is interesting. It's used to add a software-based
- * alpha channel to RGB renderbuffers. This is done by wrapping the RGB
- * renderbuffer with the alpha renderbuffer. We can do this because of the
- * OO-nature of renderbuffers.
- *
* Down the road we'll use this for run-time support of 8, 16 and 32-bit
* color channels. For example, Mesa may use 32-bit/float color channels
* internally (swrast) and use wrapper renderbuffers to convert 32-bit
rb->PutMonoValues = put_mono_values_ushort4;
break;
-#if 0
- case MESA_FORMAT_A8:
- rb->DataType = GL_UNSIGNED_BYTE;
- rb->GetValues = get_values_alpha8;
- rb->PutRow = put_row_alpha8;
- rb->PutRowRGB = NULL;
- rb->PutMonoRow = put_mono_row_alpha8;
- rb->PutValues = put_values_alpha8;
- rb->PutMonoValues = put_mono_values_alpha8;
- break;
-#endif
-
case MESA_FORMAT_S8:
rb->DataType = GL_UNSIGNED_BYTE;
rb->GetValues = get_values_ubyte;
/* for accum buffer */
rb->Format = MESA_FORMAT_SIGNED_RGBA_16;
break;
-#if 0
- case GL_ALPHA8:
- rb->Format = MESA_FORMAT_A8;
- break;
-#endif
case GL_STENCIL_INDEX:
case GL_STENCIL_INDEX1_EXT:
case GL_STENCIL_INDEX4_EXT:
}
-/**********************************************************************/
-/**********************************************************************/
-/**********************************************************************/
-
-
-/**
- * Here we utilize the gl_renderbuffer->Wrapper field to put an alpha
- * buffer wrapper around an existing RGB renderbuffer (hw or sw).
- *
- * When PutRow is called (for example), we store the alpha values in
- * this buffer, then pass on the PutRow call to the wrapped RGB
- * buffer.
- */
-
-
-static GLboolean
-alloc_storage_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb,
- GLenum internalFormat, GLuint width, GLuint height)
-{
- ASSERT(arb != arb->Wrapped);
- ASSERT(arb->Format == MESA_FORMAT_A8);
-
- /* first, pass the call to the wrapped RGB buffer */
- if (!arb->Wrapped->AllocStorage(ctx, arb->Wrapped, internalFormat,
- width, height)) {
- return GL_FALSE;
- }
-
- /* next, resize my alpha buffer */
- if (arb->Data) {
- free(arb->Data);
- }
-
- arb->Data = malloc(width * height * sizeof(GLubyte));
- if (arb->Data == NULL) {
- arb->Width = 0;
- arb->Height = 0;
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "software alpha buffer allocation");
- return GL_FALSE;
- }
-
- arb->Width = width;
- arb->Height = height;
- arb->RowStride = width;
-
- return GL_TRUE;
-}
-
-
-/**
- * Delete an alpha_renderbuffer object, as well as the wrapped RGB buffer.
- */
-static void
-delete_renderbuffer_alpha8(struct gl_renderbuffer *arb)
-{
- if (arb->Data) {
- free(arb->Data);
- }
- ASSERT(arb->Wrapped);
- ASSERT(arb != arb->Wrapped);
- arb->Wrapped->Delete(arb->Wrapped);
- arb->Wrapped = NULL;
- free(arb);
-}
-
-
-static void *
-get_pointer_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb,
- GLint x, GLint y)
-{
- return NULL; /* don't allow direct access! */
-}
-
-
-static void
-get_row_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,
- GLint x, GLint y, void *values)
-{
- /* NOTE: 'values' is RGBA format! */
- const GLubyte *src = (const GLubyte *) arb->Data + y * arb->RowStride + x;
- GLubyte *dst = (GLubyte *) values;
- GLuint i;
- ASSERT(arb != arb->Wrapped);
- ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
- /* first, pass the call to the wrapped RGB buffer */
- arb->Wrapped->GetRow(ctx, arb->Wrapped, count, x, y, values);
- /* second, fill in alpha values from this buffer! */
- for (i = 0; i < count; i++) {
- dst[i * 4 + 3] = src[i];
- }
-}
-
-
-static void
-get_values_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,
- const GLint x[], const GLint y[], void *values)
-{
- GLubyte *dst = (GLubyte *) values;
- GLuint i;
- ASSERT(arb != arb->Wrapped);
- ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
- /* first, pass the call to the wrapped RGB buffer */
- arb->Wrapped->GetValues(ctx, arb->Wrapped, count, x, y, values);
- /* second, fill in alpha values from this buffer! */
- for (i = 0; i < count; i++) {
- const GLubyte *src = (GLubyte *) arb->Data + y[i] * arb->RowStride + x[i];
- dst[i * 4 + 3] = *src;
- }
-}
-
-
-static void
-put_row_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,
- GLint x, GLint y, const void *values, const GLubyte *mask)
-{
- const GLubyte *src = (const GLubyte *) values;
- GLubyte *dst = (GLubyte *) arb->Data + y * arb->RowStride + x;
- GLuint i;
- ASSERT(arb != arb->Wrapped);
- ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
- /* first, pass the call to the wrapped RGB buffer */
- arb->Wrapped->PutRow(ctx, arb->Wrapped, count, x, y, values, mask);
- /* second, store alpha in our buffer */
- for (i = 0; i < count; i++) {
- if (!mask || mask[i]) {
- dst[i] = src[i * 4 + 3];
- }
- }
-}
-
-
-static void
-put_row_rgb_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,
- GLint x, GLint y, const void *values, const GLubyte *mask)
-{
- const GLubyte *src = (const GLubyte *) values;
- GLubyte *dst = (GLubyte *) arb->Data + y * arb->RowStride + x;
- GLuint i;
- ASSERT(arb != arb->Wrapped);
- ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
- /* first, pass the call to the wrapped RGB buffer */
- arb->Wrapped->PutRowRGB(ctx, arb->Wrapped, count, x, y, values, mask);
- /* second, store alpha in our buffer */
- for (i = 0; i < count; i++) {
- if (!mask || mask[i]) {
- dst[i] = src[i * 4 + 3];
- }
- }
-}
-
-
-static void
-put_mono_row_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,
- GLint x, GLint y, const void *value, const GLubyte *mask)
-{
- const GLubyte val = ((const GLubyte *) value)[3];
- GLubyte *dst = (GLubyte *) arb->Data + y * arb->RowStride + x;
- ASSERT(arb != arb->Wrapped);
- ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
- /* first, pass the call to the wrapped RGB buffer */
- arb->Wrapped->PutMonoRow(ctx, arb->Wrapped, count, x, y, value, mask);
- /* second, store alpha in our buffer */
- if (mask) {
- GLuint i;
- for (i = 0; i < count; i++) {
- if (mask[i]) {
- dst[i] = val;
- }
- }
- }
- else {
- memset(dst, val, count);
- }
-}
-
-
-static void
-put_values_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,
- const GLint x[], const GLint y[],
- const void *values, const GLubyte *mask)
-{
- const GLubyte *src = (const GLubyte *) values;
- GLuint i;
- ASSERT(arb != arb->Wrapped);
- ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
- /* first, pass the call to the wrapped RGB buffer */
- arb->Wrapped->PutValues(ctx, arb->Wrapped, count, x, y, values, mask);
- /* second, store alpha in our buffer */
- for (i = 0; i < count; i++) {
- if (!mask || mask[i]) {
- GLubyte *dst = (GLubyte *) arb->Data + y[i] * arb->RowStride + x[i];
- *dst = src[i * 4 + 3];
- }
- }
-}
-
-
-static void
-put_mono_values_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb,
- GLuint count, const GLint x[], const GLint y[],
- const void *value, const GLubyte *mask)
-{
- const GLubyte val = ((const GLubyte *) value)[3];
- GLuint i;
- ASSERT(arb != arb->Wrapped);
- ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
- /* first, pass the call to the wrapped RGB buffer */
- arb->Wrapped->PutValues(ctx, arb->Wrapped, count, x, y, value, mask);
- /* second, store alpha in our buffer */
- for (i = 0; i < count; i++) {
- if (!mask || mask[i]) {
- GLubyte *dst = (GLubyte *) arb->Data + y[i] * arb->RowStride + x[i];
- *dst = val;
- }
- }
-}
-
-
-static void
-copy_buffer_alpha8(struct gl_renderbuffer* dst, struct gl_renderbuffer* src)
-{
- ASSERT(dst->Format == MESA_FORMAT_A8);
- ASSERT(src->Format == MESA_FORMAT_A8);
- ASSERT(dst->Width == src->Width);
- ASSERT(dst->Height == src->Height);
- ASSERT(dst->RowStride == src->RowStride);
-
- memcpy(dst->Data, src->Data, dst->RowStride * dst->Height * sizeof(GLubyte));
-}
-
/**********************************************************************/
/**********************************************************************/
}
-/**
- * Add software-based alpha renderbuffers to the given framebuffer.
- * This is a helper routine for device drivers when creating a
- * window system framebuffer (not a user-created render/framebuffer).
- * Once this function is called, you can basically forget about this
- * renderbuffer; core Mesa will handle all the buffer management and
- * rendering!
- */
-GLboolean
-_mesa_add_alpha_renderbuffers(struct gl_context *ctx, struct gl_framebuffer *fb,
- GLuint alphaBits,
- GLboolean frontLeft, GLboolean backLeft,
- GLboolean frontRight, GLboolean backRight)
-{
- gl_buffer_index b;
-
- /* for window system framebuffers only! */
- assert(fb->Name == 0);
-
- if (alphaBits > 8) {
- _mesa_problem(ctx,
- "Unsupported bit depth in _mesa_add_alpha_renderbuffers");
- return GL_FALSE;
- }
-
- assert(MAX_COLOR_ATTACHMENTS >= 4);
-
- /* Wrap each of the RGB color buffers with an alpha renderbuffer.
- */
- for (b = BUFFER_FRONT_LEFT; b <= BUFFER_BACK_RIGHT; b++) {
- struct gl_renderbuffer *arb;
-
- if (b == BUFFER_FRONT_LEFT && !frontLeft)
- continue;
- else if (b == BUFFER_BACK_LEFT && !backLeft)
- continue;
- else if (b == BUFFER_FRONT_RIGHT && !frontRight)
- continue;
- else if (b == BUFFER_BACK_RIGHT && !backRight)
- continue;
-
- /* the RGB buffer to wrap must already exist!! */
- assert(fb->Attachment[b].Renderbuffer);
-
- /* only GLubyte supported for now */
- assert(fb->Attachment[b].Renderbuffer->DataType == GL_UNSIGNED_BYTE);
-
- /* allocate alpha renderbuffer */
- arb = _mesa_new_renderbuffer(ctx, 0);
- if (!arb) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating alpha buffer");
- return GL_FALSE;
- }
-
- /* wrap the alpha renderbuffer around the RGB renderbuffer */
- arb->Wrapped = fb->Attachment[b].Renderbuffer;
-
- /* Set up my alphabuffer fields and plug in my functions.
- * The functions will put/get the alpha values from/to RGBA arrays
- * and then call the wrapped buffer's functions to handle the RGB
- * values.
- */
- arb->InternalFormat = arb->Wrapped->InternalFormat;
- arb->Format = MESA_FORMAT_A8;
- arb->DataType = arb->Wrapped->DataType;
- arb->AllocStorage = alloc_storage_alpha8;
- arb->Delete = delete_renderbuffer_alpha8;
- arb->GetPointer = get_pointer_alpha8;
- arb->GetRow = get_row_alpha8;
- arb->GetValues = get_values_alpha8;
- arb->PutRow = put_row_alpha8;
- arb->PutRowRGB = put_row_rgb_alpha8;
- arb->PutMonoRow = put_mono_row_alpha8;
- arb->PutValues = put_values_alpha8;
- arb->PutMonoValues = put_mono_values_alpha8;
-
- /* clear the pointer to avoid assertion/sanity check failure later */
- fb->Attachment[b].Renderbuffer = NULL;
-
- /* plug the alpha renderbuffer into the colorbuffer attachment */
- _mesa_add_renderbuffer(fb, b, arb);
- }
-
- return GL_TRUE;
-}
-
-
-/**
- * For framebuffers that use a software alpha channel wrapper
- * created by _mesa_add_alpha_renderbuffer or _mesa_add_soft_renderbuffers,
- * copy the back buffer alpha channel into the front buffer alpha channel.
- */
-void
-_mesa_copy_soft_alpha_renderbuffers(struct gl_context *ctx, struct gl_framebuffer *fb)
-{
- if (fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer &&
- fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer)
- copy_buffer_alpha8(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer,
- fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
-
-
- if (fb->Attachment[BUFFER_FRONT_RIGHT].Renderbuffer &&
- fb->Attachment[BUFFER_BACK_RIGHT].Renderbuffer)
- copy_buffer_alpha8(fb->Attachment[BUFFER_FRONT_RIGHT].Renderbuffer,
- fb->Attachment[BUFFER_BACK_RIGHT].Renderbuffer);
-}
-
-
/**
* Add a software-based depth renderbuffer to the given framebuffer.
* This is a helper routine for device drivers when creating a
fb->Visual.numAuxBuffers);
}
- if (alpha) {
- assert(fb->Visual.alphaBits > 0);
- _mesa_add_alpha_renderbuffers(NULL, fb, fb->Visual.alphaBits,
- frontLeft, backLeft,
- frontRight, backRight);
- }
-
#if 0
if (multisample) {
/* maybe someday */
projects / mesa.git / commitdiff