/**
* Called by glReadBuffer to set the source renderbuffer for reading pixels.
* \param mode color buffer such as GL_FRONT, GL_BACK, etc.
*/
void GLAPIENTRY
_mesa_ReadBuffer(GLenum buffer)
{
struct gl_framebuffer *fb;
GLbitfield supportedMask;
GLint srcBuffer;
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
fb = ctx->ReadBuffer;
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
if (_mesa_is_user_fbo(fb) && buffer == GL_NONE) {
/* This is legal for user-created framebuffer objects */
srcBuffer = -1;
}
else {
/* general case / window-system framebuffer */
srcBuffer = read_buffer_enum_to_index(buffer);
if (srcBuffer == -1) {
_mesa_error(ctx, GL_INVALID_ENUM,
"glReadBuffer(buffer=0x%x)", buffer);
return;
}
supportedMask = supported_buffer_bitmask(ctx, fb);
if (((1 << srcBuffer) & supportedMask) == 0) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadBuffer(buffer=0x%x)", buffer);
return;
}
}
/* OK, all error checking has been completed now */
_mesa_readbuffer(ctx, buffer, srcBuffer);
ctx->NewState |= _NEW_BUFFERS;
/*
* Call device driver function.
*/
if (ctx->Driver.ReadBuffer)
(*ctx->Driver.ReadBuffer)(ctx, buffer);
}
/**
* Called by glReadBuffer to set the source renderbuffer for reading pixels.
* \param mode color buffer such as GL_FRONT, GL_BACK, etc.
*/
void GLAPIENTRY
_mesa_ReadBuffer(GLenum buffer)
{
struct gl_framebuffer *fb;
GLbitfield supportedMask;
GLint srcBuffer;
GET_CURRENT_CONTEXT(ctx);
FLUSH_VERTICES(ctx, 0);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
fb = ctx->ReadBuffer;
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
if (buffer == GL_NONE) {
/* This is legal--it means that no buffer should be bound for reading. */
srcBuffer = -1;
}
else {
/* general case / window-system framebuffer */
srcBuffer = read_buffer_enum_to_index(buffer);
if (srcBuffer == -1) {
_mesa_error(ctx, GL_INVALID_ENUM,
"glReadBuffer(buffer=0x%x)", buffer);
return;
}
supportedMask = supported_buffer_bitmask(ctx, fb);
if (((1 << srcBuffer) & supportedMask) == 0) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadBuffer(buffer=0x%x)", buffer);
return;
}
}
/* OK, all error checking has been completed now */
_mesa_readbuffer(ctx, buffer, srcBuffer);
/*
* Call device driver function.
*/
if (ctx->Driver.ReadBuffer)
(*ctx->Driver.ReadBuffer)(ctx, buffer);
}
/**
* Called by glReadBuffer to set the source renderbuffer for reading pixels.
* \param mode color buffer such as GL_FRONT, GL_BACK, etc.
*/
void
_mesa_read_buffer(struct gl_context *ctx, struct gl_framebuffer *fb,
GLenum buffer, const char *caller)
{
GLbitfield supportedMask;
GLint srcBuffer;
FLUSH_VERTICES(ctx, 0);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "%s %s\n", caller, _mesa_enum_to_string(buffer));
if (buffer == GL_NONE) {
/* This is legal--it means that no buffer should be bound for reading. */
srcBuffer = -1;
}
else {
/* general case / window-system framebuffer */
srcBuffer = read_buffer_enum_to_index(buffer);
if (srcBuffer == -1) {
_mesa_error(ctx, GL_INVALID_ENUM,
"%s(invalid buffer %s)", caller,
_mesa_enum_to_string(buffer));
return;
}
supportedMask = supported_buffer_bitmask(ctx, fb);
if (((1 << srcBuffer) & supportedMask) == 0) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(invalid buffer %s)", caller,
_mesa_enum_to_string(buffer));
return;
}
}
/* OK, all error checking has been completed now */
_mesa_readbuffer(ctx, fb, buffer, srcBuffer);
/* Call the device driver function only if fb is the bound read buffer */
if (fb == ctx->ReadBuffer) {
if (ctx->Driver.ReadBuffer)
(*ctx->Driver.ReadBuffer)(ctx, buffer);
}
}