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authorGerd Hoffmann <kraxel@redhat.com>2017-10-10 15:54:50 +0200
committerGerd Hoffmann <kraxel@redhat.com>2017-10-17 10:25:42 +0200
commit2e1d70b9e03ca3f1c6185b54010bc9e47e0a0d0c (patch)
tree98f4a8f35a8a696ddcae2a20ea87db4425c8d396 /ui/shader.c
parent46e19e149f3b129a22c440caba853188df67deab (diff)
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opengl: add flipping vertex shader
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
Diffstat (limited to 'ui/shader.c')
-rw-r--r--ui/shader.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/ui/shader.c b/ui/shader.c
index d36e7af..008458b 100644
--- a/ui/shader.c
+++ b/ui/shader.c
@@ -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);
}