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Tests: Add damage tracking to MSAA

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This lets compositors avoid re-rendering the entire buffer when only the
outside of the squares changed.

If glfwGetBufferAge() returns 0 for any reason (the buffer was just
created, there was an error, or the underlying API doesn’t track buffer
age), we swap the entire buffer again.
This commit is contained in:
Emmanuel Gil Peyrot 2019-12-08 16:14:59 +01:00
parent c8233ce7d3
commit 8e51c4a577
1 changed files with 21 additions and 1 deletions
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22
tests/msaa.c
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@ -102,6 +102,19 @@ int main(int argc, char** argv)
GLuint vertex_buffer, vertex_shader, fragment_shader, program;
GLint mvp_location, vpos_location;
// Minimum static damage for both squares.
GLFWrect rects[8] =
{{ 25, 25, 350, 90},
{ 25, 285, 350, 90},
{ 25, 115, 90, 170},
{285, 115, 90, 170},
{425, 25, 350, 90},
{425, 285, 350, 90},
{425, 115, 90, 170},
{685, 115, 90, 170},
};
while ((ch = getopt(argc, argv, "hs:")) != -1)
{
switch (ch)
@ -178,11 +191,13 @@ int main(int argc, char** argv)
while (!glfwWindowShouldClose(window))
{
float ratio;
int buffer_age;
int width, height;
mat4x4 m, p, mvp;
const double angle = glfwGetTime() * M_PI / 180.0;
glfwGetFramebufferSize(window, &width, &height);
buffer_age = glfwGetBufferAge(window);
ratio = width / (float) height;
glViewport(0, 0, width, height);
@ -208,7 +223,12 @@ int main(int argc, char** argv)
glEnable(GL_MULTISAMPLE);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glfwSwapBuffers(window);
// If buffer_age is 0, we can’t assume anything about the previous buffer
// so swap the entire buffer.
if (buffer_age > 0)
glfwSwapBuffersWithDamage(window, rects, 8);
else
glfwSwapBuffers(window);
glfwPollEvents();
}