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nv2a: Add flip option in glo_readpixels

This commit is contained in:
Matt Borgerson 2021-07-20 03:00:27 -07:00 committed by mborgerson
parent 5b81102519
commit 814d7e0a9a
2 changed files with 17 additions and 27 deletions
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6
hw/xbox/nv2a/gl/gloffscreen.h
View File

@ -55,12 +55,12 @@ bool glo_check_extension(const char* ext_name);
/* Create an OpenGL context */
GloContext *glo_context_create(void);
/* Destroy a previouslu created OpenGL context */
/* Destroy a previously created OpenGL context */
void glo_context_destroy(GloContext *context);
/* Note that this is top-down, not bottom-up as glReadPixels would do. */
void glo_readpixels(GLenum gl_format, GLenum gl_type,
unsigned int bytes_per_pixel, unsigned int stride,
unsigned int width, unsigned int height, void *data);
unsigned int width, unsigned int height, bool vflip,
void *data);
#endif /* GLOFFSCREEN_H_ */

38
hw/xbox/nv2a/gl/gloffscreen_common.c
View File

@ -33,7 +33,8 @@
void glo_readpixels(GLenum gl_format, GLenum gl_type,
unsigned int bytes_per_pixel, unsigned int stride,
unsigned int width, unsigned int height, void *data)
unsigned int width, unsigned int height, bool vflip,
void *data)
{
/* TODO: weird strides */
assert(stride % bytes_per_pixel == 0);
@ -45,32 +46,21 @@ void glo_readpixels(GLenum gl_format, GLenum gl_type,
glPixelStorei(GL_PACK_ROW_LENGTH, stride / bytes_per_pixel);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
#ifdef GETCONTENTS_INDIVIDUAL
GLubyte *b = (GLubyte *) data;
int irow;
for (irow = height - 1; irow >= 0; irow--) {
glReadPixels(0, irow, width, 1, gl_format, gl_type, b);
b += stride;
}
#else
/* Faster buffer flip */
GLubyte *b = (GLubyte *) data;
GLubyte *c = &((GLubyte *) data)[stride * (height - 1)];
GLubyte *tmp = (GLubyte *) malloc(width * bytes_per_pixel);
int irow;
glReadPixels(0, 0, width, height, gl_format, gl_type, data);
for (irow = 0; irow < height / 2; irow++) {
memcpy(tmp, b, width * bytes_per_pixel);
memcpy(b, c, width * bytes_per_pixel);
memcpy(c, tmp, width * bytes_per_pixel);
b += stride;
c -= stride;
if (vflip) {
GLubyte *b = (GLubyte *) data;
GLubyte *c = &((GLubyte *) data)[stride * (height - 1)];
GLubyte *tmp = (GLubyte *) malloc(width * bytes_per_pixel);
for (int irow = 0; irow < height / 2; irow++) {
memcpy(tmp, b, width * bytes_per_pixel);
memcpy(b, c, width * bytes_per_pixel);
memcpy(c, tmp, width * bytes_per_pixel);
b += stride;
c -= stride;
}
free(tmp);
}
free(tmp);
#endif
/* Restore GL state */
glPixelStorei(GL_PACK_ROW_LENGTH, rl);