X-Git-Url: https://repo.jachan.dev/qemu.git/blobdiff_plain/985e1c9b008e5e8b6eac41546266d3abcfa6282a..30456d5ba3736b8f0c73560e559cdd2f76a4885e:/ui/shader.c

diff --git a/ui/shader.c b/ui/shader.c
index c3272d690b..9264009b80 100644
--- a/ui/shader.c
+++ b/ui/shader.c
@@ -24,11 +24,52 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+#include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "ui/shader.h"
 
 /* ---------------------------------------------------------------------- */
 
+GLuint qemu_gl_init_texture_blit(GLint texture_blit_prog)
+{
+    static const GLfloat in_position[] = {
+        -1, -1,
+        1,  -1,
+        -1,  1,
+        1,   1,
+    };
+    GLint l_position;
+    GLuint vao, buffer;
+
+    glGenVertexArrays(1, &vao);
+    glBindVertexArray(vao);
+
+    /* this is the VBO that holds the vertex data */
+    glGenBuffers(1, &buffer);
+    glBindBuffer(GL_ARRAY_BUFFER, buffer);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(in_position), in_position,
+                 GL_STATIC_DRAW);
+
+    l_position = glGetAttribLocation(texture_blit_prog, "in_position");
+    glVertexAttribPointer(l_position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+    glEnableVertexAttribArray(l_position);
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+
+    return vao;
+}
+
+void qemu_gl_run_texture_blit(GLint texture_blit_prog,
+                              GLint texture_blit_vao)
+{
+    glUseProgram(texture_blit_prog);
+    glBindVertexArray(texture_blit_vao);
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+}
+
+/* ---------------------------------------------------------------------- */
+
 GLuint qemu_gl_create_compile_shader(GLenum type, const GLchar *src)
 {
     GLuint shader;