/**
* Specify a buffer object to receive vertex shader results.
* As above, but start at offset = 0.
* Called from the glBindBufferBase() function.
*/
void
_mesa_bind_buffer_base_transform_feedback(struct gl_context *ctx,
GLuint index,
struct gl_buffer_object *bufObj)
{
struct gl_transform_feedback_object *obj;
GLsizeiptr size;
obj = ctx->TransformFeedback.CurrentObject;
if (obj->Active) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glBindBufferBase(transform feedback active)");
return;
}
if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
_mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index);
return;
}
/* default size is the buffer size rounded down to nearest
* multiple of four.
*/
size = bufObj->Size & ~0x3;
bind_buffer_range(ctx, index, bufObj, 0, size);
}
/**
* Specify a buffer object to receive vertex shader results, plus the
* offset in the buffer to start placing results.
* This function is part of GL_EXT_transform_feedback, but not GL3.
*/
void GLAPIENTRY
_mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer,
GLintptr offset)
{
struct gl_transform_feedback_object *obj;
struct gl_buffer_object *bufObj;
GET_CURRENT_CONTEXT(ctx);
GLsizeiptr size;
if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
_mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferOffsetEXT(target)");
return;
}
obj = ctx->TransformFeedback.CurrentObject;
if (obj->Active) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glBindBufferOffsetEXT(transform feedback active)");
return;
}
if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glBindBufferOffsetEXT(index=%d)", index);
return;
}
if (offset & 0x3) {
/* must be multiple of four */
_mesa_error(ctx, GL_INVALID_VALUE,
"glBindBufferOffsetEXT(offset=%d)", (int) offset);
return;
}
if (buffer == 0) {
bufObj = ctx->Shared->NullBufferObj;
} else {
bufObj = _mesa_lookup_bufferobj(ctx, buffer);
}
if (!bufObj) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glBindBufferOffsetEXT(invalid buffer=%u)", buffer);
return;
}
/* default size is the buffer size rounded down to nearest
* multiple of four.
*/
size = (bufObj->Size - offset) & ~0x3;
bind_buffer_range(ctx, index, bufObj, offset, size);
}
/**
* Specify a buffer object to receive transform feedback results.
* As above, but start at offset = 0.
* Called from the glBindBufferBase() and glTransformFeedbackBufferBase()
* functions.
*/
void
_mesa_bind_buffer_base_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj,
GLuint index,
struct gl_buffer_object *bufObj,
bool dsa)
{
if (obj->Active) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(transform feedback active)",
dsa ? "glTransformFeedbackBufferBase" : "glBindBufferBase");
return;
}
if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
_mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%d out of bounds)",
dsa ? "glTransformFeedbackBufferBase" : "glBindBufferBase",
index);
return;
}
bind_buffer_range(ctx, obj, index, bufObj, 0, 0, dsa);
}
/**
* Specify a buffer object to receive vertex shader results. Plus,
* specify the starting offset to place the results, and max size.
* Called from the glBindBufferRange() function.
*/
void
_mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx,
GLuint index,
struct gl_buffer_object *bufObj,
GLintptr offset,
GLsizeiptr size)
{
struct gl_transform_feedback_object *obj;
obj = ctx->TransformFeedback.CurrentObject;
if (obj->Active) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glBindBufferRange(transform feedback active)");
return;
}
if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
_mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index);
return;
}
if (size & 0x3) {
/* must a multiple of four */
_mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(size=%d)", (int) size);
return;
}
if (offset & 0x3) {
/* must be multiple of four */
_mesa_error(ctx, GL_INVALID_VALUE,
"glBindBufferRange(offset=%d)", (int) offset);
return;
}
bind_buffer_range(ctx, index, bufObj, offset, size);
}
/**
* Specify a buffer object to receive transform feedback results. Plus,
* specify the starting offset to place the results, and max size.
* Called from the glBindBufferRange() and glTransformFeedbackBufferRange
* functions.
*/
void
_mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj,
GLuint index,
struct gl_buffer_object *bufObj,
GLintptr offset,
GLsizeiptr size,
bool dsa)
{
const char *gl_methd_name;
if (dsa)
gl_methd_name = "glTransformFeedbackBufferRange";
else
gl_methd_name = "glBindBufferRange";
if (obj->Active) {
_mesa_error(ctx, GL_INVALID_OPERATION, "%s(transform feedback active)",
gl_methd_name);
return;
}
if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
/* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
* generated if index is greater than or equal to the number of binding
* points for transform feedback, as described in section 6.7.1."
*/
_mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%d out of bounds)",
gl_methd_name, index);
return;
}
if (size & 0x3) {
/* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
_mesa_error(ctx, GL_INVALID_VALUE, "%s(size=%d must be a multiple of "
"four)", gl_methd_name, (int) size);
return;
}
if (offset & 0x3) {
/* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
_mesa_error(ctx, GL_INVALID_VALUE, "%s(offset=%d must be a multiple "
"of four)", gl_methd_name, (int) offset);
return;
}
if (offset < 0) {
/* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
* generated by BindBufferRange if offset is negative."
*
* OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
* is generated by TransformFeedbackBufferRange if offset is negative."
*/
_mesa_error(ctx, GL_INVALID_VALUE, "%s(offset=%d must be >= 0)",
gl_methd_name,
(int) offset);
return;
}
if (size <= 0 && (dsa || bufObj != ctx->Shared->NullBufferObj)) {
/* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
* generated by BindBufferRange if buffer is non-zero and size is less
* than or equal to zero."
*
* OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
* is generated by TransformFeedbackBufferRange if size is less than or
* equal to zero."
*/
_mesa_error(ctx, GL_INVALID_VALUE, "%s(size=%d must be > 0)",
gl_methd_name, (int) size);
return;
}
bind_buffer_range(ctx, obj, index, bufObj, offset, size, dsa);
}
