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opengl: add flipping vertex shader

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Add vertex shader which flips the texture upside down while blitting it.
Add argument to qemu_gl_run_texture_blit() to enable flipping.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20171010135453.6704-4-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2017-10-10 15:54:50 +02:00
parent 46e19e149f
commit 2e1d70b9e0
5 changed files with 24 additions and 6 deletions
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12
ui/shader.c
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@ -29,10 +29,12 @@
#include "ui/shader.h"
#include "shader/texture-blit-vert.h"
#include "shader/texture-blit-flip-vert.h"
#include "shader/texture-blit-frag.h"
struct QemuGLShader {
GLint texture_blit_prog;
GLint texture_blit_flip_prog;
GLint texture_blit_vao;
};
@ -68,9 +70,11 @@ static GLuint qemu_gl_init_texture_blit(GLint texture_blit_prog)
return vao;
}
void qemu_gl_run_texture_blit(QemuGLShader *gls)
void qemu_gl_run_texture_blit(QemuGLShader *gls, bool flip)
{
glUseProgram(gls->texture_blit_prog);
glUseProgram(flip
? gls->texture_blit_flip_prog
: gls->texture_blit_prog);
glBindVertexArray(gls->texture_blit_vao);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
@ -150,7 +154,9 @@ QemuGLShader *qemu_gl_init_shader(void)
gls->texture_blit_prog = qemu_gl_create_compile_link_program
(texture_blit_vert_src, texture_blit_frag_src);
if (!gls->texture_blit_prog) {
gls->texture_blit_flip_prog = qemu_gl_create_compile_link_program
(texture_blit_flip_vert_src, texture_blit_frag_src);
if (!gls->texture_blit_prog || !gls->texture_blit_flip_prog) {
exit(1);
}