- _mesa_buffer_clear_subdata: default callback for dd function table
- _mesa_ClearBufferData: API function
- _mesa_ClearBufferSubData: API function
*NOTE* According to the spec, it should be possible to clear some part of
a buffer, even if a different, non-overlapping part is mapped, this is currently
not possible. It was suggested to implement ClearBufferSubData using
MapBufferRange. However, this does not work if a part of the buffer is already
mapped. I am open for suggestions.
Modify get_buffer to return the correct error for this extension
---
src/mesa/main/bufferobj.c | 206 +++++++++++++++++++++++++++++++++++++++++++++-
src/mesa/main/bufferobj.h | 4 +
2 files changed, 209 insertions(+), 1 deletion(-)
diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index bfeed83..66d6ad4 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -41,6 +41,9 @@
#include "fbobject.h"
#include "mtypes.h"
#include "texobj.h"
+#include "teximage.h"
+#include "glformats.h"
+#include "texstore.h"
#include "transformfeedback.h"
#include "dispatch.h"
@@ -138,7 +141,13 @@ get_buffer(struct gl_context *ctx, const char *func,
GLenum target)
}
if (!_mesa_is_bufferobj(*bufObj)) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "%s(buffer 0)", func);
+ if (strcmp(func, "glClearBufferSubData\0") == 0 ||
+ strcmp(func, "glClearBufferData\0") == 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "%s(no buffer bound)", func);
+ }
+ else {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "%s(buffer 0)", func);
+ }
return NULL;
}
@@ -539,6 +548,64 @@ _mesa_buffer_get_subdata( struct gl_context *ctx,
GLintptrARB offset,
/**
+ * Clear a subrange of buffer object with supplied data. If the data range
+ * specified by \c size + \c offset extends beyond the end of the buffer
+ * the error INVALID_VALUE is generated, if data is NULL the buffer is filled
+ * with zeros.
+ *
+ * This is the default callback for \c dd_function_table::ClearBufferSubData()
+ * Note that all GL error checking will have been done already.
+ *
+ * \param ctx GL context.
+ * \param internalformat Internal format of the buffer data.
+ * \param offset Offset of the first byte to be cleared.
+ * \param size Size, in bytes, of the data range.
+ * \param format Format of the supplied data.
+ * \param type Type of the supplied data.
+ * \param data Source of the data.
+ * \param bufObj Object to be used.
+ *
+ * \sa glClearBufferSubDataARB, dd_function_table::ClearBufferSubData.
+ */
+static void
+_mesa_buffer_clear_subdata( struct gl_context *ctx, GLenum internalformat,
+ GLintptr offset, GLsizeiptr size,
+ GLenum format, GLenum type,
+ const GLvoid *data, struct gl_buffer_object
*bufObj )
+{
+ ASSERT(ctx->Driver.MapBufferRange);
+ void *dest = ctx->Driver.MapBufferRange(ctx, offset, size,
+ GL_MAP_WRITE_BIT |
GL_MAP_INVALIDATE_RANGE_BIT,
+ bufObj);
+
+ if (data == NULL)
+ {
+ memset(dest, 0, size);
+ ctx->Driver.UnmapBuffer(ctx, bufObj);
+ return;
+ }
+
+ gl_format formatMesa = _mesa_validate_texbuffer_format(ctx, internalformat);
+ GLenum formatBase = _mesa_get_format_base_format(formatMesa);
+
+ size_t sizeOfFormat = _mesa_get_format_bytes(formatMesa);
+
+ GLubyte* src = malloc(sizeOfFormat);
+ _mesa_texstore(ctx, 1, formatBase, formatMesa, 0,
+ &src, 1, 1, 1, format, type, data, &ctx->Unpack);
+
+ for (int i = 0; i < size/sizeOfFormat; ++i)
+ {
+ memcpy(dest, src, sizeOfFormat);
+ dest += sizeOfFormat;
+ }
+ ctx->Driver.UnmapBuffer(ctx, bufObj);
+
+ free(src);
+}
+
+
+/**
* Default fallback for \c dd_function_table::MapBufferRange().
* Called via glMapBufferRange().
*/
@@ -844,6 +911,9 @@ _mesa_init_buffer_object_functions(struct dd_function_table
*driver)
driver->GetBufferSubData = _mesa_buffer_get_subdata;
driver->UnmapBuffer = _mesa_buffer_unmap;
+ /* GL_ARB_clear_buffer_object */
+ driver->ClearBufferSubData = _mesa_buffer_clear_subdata;
+
/* GL_ARB_map_buffer_range */
driver->MapBufferRange = _mesa_buffer_map_range;
driver->FlushMappedBufferRange = _mesa_buffer_flush_mapped_range;
@@ -1172,6 +1242,140 @@ _mesa_GetBufferSubData(GLenum target, GLintptrARB
offset,
}
+void GLAPIENTRY
+_mesa_ClearBufferData(GLenum target, GLenum internalformat, GLenum format,
+ GLenum type, const GLvoid * data)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ gl_format internalFormatMesa = _mesa_validate_texbuffer_format(ctx,
internalformat);
+ if (internalFormatMesa == MESA_FORMAT_NONE) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glClearBufferData(invalid internalformat)");
+ return;
+ }
+
+ /* NOTE: not mentioned in ARB_clear_buffer_object but according to
+ * EXT_texture_integer there is no conversion between integer and
+ * non-integer formats
+ */
+ if (_mesa_is_color_format(internalformat)) {
+ if (_mesa_is_enum_format_signed_int(format)
+ !=
+ _mesa_is_format_integer_color(internalFormatMesa)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glClearBufferData(integer vs non-integer)");
+ return;
+ }
+ }
+
+ if (!_mesa_is_color_format(format)) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glClearBufferData(no color format)");
+ }
+
+ struct gl_buffer_object* bufObj = get_buffer(ctx, "glClearBufferData",
target);
+ if (!bufObj) {
+ return;
+ }
+
+ GLenum errorFormatType = _mesa_error_check_format_and_type(ctx, format,
type);
+ if (errorFormatType != GL_NO_ERROR) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glClearBufferData(invalid format or type)");
+ return;
+ }
+
+ GLint sizeOfFormat = _mesa_get_format_bytes(internalFormatMesa);
+ if (bufObj->Size % sizeOfFormat != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glClearBufferData(buffer size no multiple of internalformat
size)");
+ }
+
+ if (_mesa_bufferobj_mapped(bufObj)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glClearBufferData(buffer currently mapped)");
+ return;
+ }
+
+ ctx->Driver.ClearBufferSubData( ctx, internalformat, 0, bufObj->Size,
+ format, type, data, bufObj );
+}
+
+
+void GLAPIENTRY
+_mesa_ClearBufferSubData(GLenum target, GLenum internalformat, GLintptr offset,
+ GLsizeiptr size, GLenum format, GLenum type,
+ const GLvoid * data)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ gl_format internalFormatMesa = _mesa_validate_texbuffer_format(ctx,
internalformat);
+ if (internalFormatMesa == MESA_FORMAT_NONE) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glClearBufferSubData(invalid internalformat)");
+ return;
+ }
+
+ if (_mesa_is_color_format(internalformat)) {
+ if (_mesa_is_enum_format_signed_int(format)
+ !=
+ _mesa_is_format_integer_color(internalFormatMesa)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glClearBufferData(integer vs non-integer)");
+ return;
+ }
+ }
+
+ if (!_mesa_is_color_format(format)) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glClearBufferSubData(no color format)");
+ }
+
+ struct gl_buffer_object* bufObj = get_buffer(ctx, "glClearBufferSubData",
+ target);
+ if (!bufObj) {
+ return;
+ }
+
+ GLenum errorFormatType = _mesa_error_check_format_and_type(ctx, format,
type);
+ if (errorFormatType != GL_NO_ERROR) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glClearBufferSubData(invalid format or type)");
+ return;
+ }
+
+ if (offset < 0 || size < 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glClearBufferSubData(offset or size less than zero)");
+ return;
+ }
+
+ if (bufObj->Size < offset + size) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferSubData(range error)");
+ }
+
+ GLint sizeOfFormat = _mesa_get_format_bytes(internalFormatMesa);
+ if (offset % sizeOfFormat != 0 || size % sizeOfFormat != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glClearBufferSubData(offset or size no multiple of
internalformat size)");
+ }
+
+ if (_mesa_bufferobj_mapped(bufObj)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glClearBufferSubData(intersection with mapped range)");
+ return;
+ }
+/* if (_mesa_bufferobj_range_mapped(bufObj, offset, size)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glClearBufferSubData(intersection with mapped range)");
+ }*/
+
+ ctx->Driver.ClearBufferSubData( ctx, internalformat, offset, size,
+ format, type, data, bufObj );
+}
+
+
void * GLAPIENTRY
_mesa_MapBuffer(GLenum target, GLenum access)
{
diff --git a/src/mesa/main/bufferobj.h b/src/mesa/main/bufferobj.h
index 0b898a2..b38519f 100644
--- a/src/mesa/main/bufferobj.h
+++ b/src/mesa/main/bufferobj.h
@@ -120,6 +120,10 @@ void GLAPIENTRY
_mesa_BufferSubData(GLenum target, GLintptrARB offset, GLsizeiptrARB size,
const GLvoid * data);
void GLAPIENTRY
_mesa_GetBufferSubData(GLenum target, GLintptrARB offset, GLsizeiptrARB size,
void * data);
+void GLAPIENTRY
+_mesa_ClearBufferData(GLenum target, GLenum internalformat, GLenum format,
GLenum type, const GLvoid * data);
+void GLAPIENTRY
+_mesa_ClearBufferSubData(GLenum target, GLenum internalformat, GLintptr
offset, GLsizeiptr size, GLenum format, GLenum type, const GLvoid * data);
void * GLAPIENTRY
_mesa_MapBuffer(GLenum target, GLenum access);
GLboolean GLAPIENTRY
--
1.8.3.1
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