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mesa: add transform_feedback_varyings() helper

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Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
This commit is contained in:
Samuel Pitoiset 2017-08-24 14:47:15 +02:00
parent 4b5140d20b
commit a5319d9fde
1 changed files with 37 additions and 26 deletions
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63
src/mesa/main/transformfeedback.c
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@ -832,6 +832,42 @@ _mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer,
* This function specifies the transform feedback outputs to be written
* to the feedback buffer(s), and in what order.
*/
static ALWAYS_INLINE void
transform_feedback_varyings(struct gl_context *ctx,
struct gl_shader_program *shProg, GLsizei count,
const GLchar *const *varyings, GLenum bufferMode)
{
GLint i;
/* free existing varyings, if any */
for (i = 0; i < (GLint) shProg->TransformFeedback.NumVarying; i++) {
free(shProg->TransformFeedback.VaryingNames[i]);
}
free(shProg->TransformFeedback.VaryingNames);
/* allocate new memory for varying names */
shProg->TransformFeedback.VaryingNames =
malloc(count * sizeof(GLchar *));
if (!shProg->TransformFeedback.VaryingNames) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glTransformFeedbackVaryings()");
return;
}
/* Save the new names and the count */
for (i = 0; i < count; i++) {
shProg->TransformFeedback.VaryingNames[i] = strdup(varyings[i]);
}
shProg->TransformFeedback.NumVarying = count;
shProg->TransformFeedback.BufferMode = bufferMode;
/* No need to invoke FLUSH_VERTICES or flag NewTransformFeedback since
* the varyings won't be used until shader link time.
*/
}
void GLAPIENTRY
_mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
const GLchar * const *varyings,
@ -907,32 +943,7 @@ _mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
}
}
/* free existing varyings, if any */
for (i = 0; i < (GLint) shProg->TransformFeedback.NumVarying; i++) {
free(shProg->TransformFeedback.VaryingNames[i]);
}
free(shProg->TransformFeedback.VaryingNames);
/* allocate new memory for varying names */
shProg->TransformFeedback.VaryingNames =
malloc(count * sizeof(GLchar *));
if (!shProg->TransformFeedback.VaryingNames) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glTransformFeedbackVaryings()");
return;
}
/* Save the new names and the count */
for (i = 0; i < count; i++) {
shProg->TransformFeedback.VaryingNames[i] = strdup(varyings[i]);
}
shProg->TransformFeedback.NumVarying = count;
shProg->TransformFeedback.BufferMode = bufferMode;
/* No need to invoke FLUSH_VERTICES or flag NewTransformFeedback since
* the varyings won't be used until shader link time.
*/
transform_feedback_varyings(ctx, shProg, count, varyings, bufferMode);
}