[Piglit] [PATCH] fbo: test that swizzle doesn't affect mipmap generation

[Chris Forbes]

This seems needlessly complex with the FBO machinery. Presumably if
you just upload your solid red to the base level, (and something else
well-defined to the other levels, to avoid accidental passes if
glGenerateMipmap were broken completely) you can get rid of it all.

> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + * Authors:
> + *    Eric Anholt <eric at anholt.net>

Presumably, yourself too?

> + *
> + */
> +
> +/** @file fbo-generatemipmap-scissor.c

This should name the correct file

> + *
> + * Tests that glGenerateMipmapEXT works correctly on a 2D texture with a
> + * swizzle set via ARB_texture_swizzle
> + *
> + * Compare this test to fbo-generatemipmap.c.
> + */
> +
> +#include "piglit-util-gl-common.h"
> +
> +#define TEX_WIDTH 256
> +#define TEX_HEIGHT 256
> +
> +PIGLIT_GL_TEST_CONFIG_BEGIN
> +
> +       config.supports_gl_compat_version = 10;
> +
> +       config.window_width = 700;
> +       config.window_height = 300;
> +       config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
> +
> +PIGLIT_GL_TEST_CONFIG_END
> +
> +static const float red[] =   {1, 0, 0, 0};
> +static const float green[] = {0, 1, 0, 0};
> +
> +static const GLint swizzle[4] = { GL_ZERO, GL_RED, GL_ZERO, GL_ZERO };
> +
> +static int
> +create_fbo(void)
> +{
> +       GLuint tex, fb;
> +       GLenum status;
> +       int i, dim;
> +
> +       glGenTextures(1, &tex);
> +       glBindTexture(GL_TEXTURE_2D, tex);
> +       glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzle);
> +
> +       for (i = 0, dim = TEX_WIDTH; dim >0; i++, dim /= 2) {
> +               glTexImage2D(GL_TEXTURE_2D, i, GL_RED,
> +                            dim, dim,
> +                            0,
> +                            GL_RED, GL_UNSIGNED_BYTE, NULL);
> +       }
> +       assert(glGetError() == 0);
> +
> +       glGenFramebuffersEXT(1, &fb);
> +       glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
> +       glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
> +                                 GL_COLOR_ATTACHMENT0_EXT,
> +                                 GL_TEXTURE_2D,
> +                                 tex,
> +                                 0);
> +       assert(glGetError() == 0);
> +
> +       status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
> +       if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
> +               fprintf(stderr, "FBO incomplete\n");
> +               goto done;
> +       }
> +
> +       glViewport(0, 0, TEX_WIDTH, TEX_HEIGHT);
> +       piglit_ortho_projection(TEX_WIDTH, TEX_HEIGHT, GL_FALSE);
> +
> +       glColor4fv(red);
> +       piglit_draw_rect(0, 0, TEX_WIDTH, TEX_HEIGHT);
> +
> +       glGenerateMipmapEXT(GL_TEXTURE_2D);
> +done:
> +       glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
> +       glDeleteFramebuffersEXT(1, &fb);
> +
> +       return tex;
> +}
> +
> +static void
> +draw_mipmap(int x, int y, int dim)
> +{
> +       glViewport(0, 0, piglit_width, piglit_height);
> +       piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
> +
> +       glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
> +
> +       glEnable(GL_TEXTURE_2D);
> +       glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
> +       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
> +       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
> +
> +       piglit_draw_rect_tex(x, y, dim, dim,
> +                            0, 0, 1, 1);
> +}
> +
> +static GLboolean
> +test_mipmap_drawing(int start_x, int start_y, int dim)
> +{
> +       return piglit_probe_rect_rgb(start_x, start_y, dim, dim, green);
> +}
> +
> +enum piglit_result
> +piglit_display(void)
> +{
> +       GLboolean pass = GL_TRUE;
> +       int dim;
> +       GLuint tex;
> +       int x;
> +
> +       glClearColor(0.5, 0.5, 0.5, 0.5);
> +       glClear(GL_COLOR_BUFFER_BIT);
> +
> +       tex = create_fbo();
> +
> +       x = 1;
> +       for (dim = TEX_WIDTH; dim > 1; dim /= 2) {
> +               draw_mipmap(x, 1, dim);
> +               x += dim + 1;
> +       }
> +
> +       x = 1;
> +       for (dim = TEX_WIDTH; dim > 1; dim /= 2) {
> +               pass &= test_mipmap_drawing(x, 1, dim);
> +               x += dim + 1;
> +       }
> +
> +       glDeleteTextures(1, &tex);
> +
> +       piglit_present_results();
> +
> +       return pass ? PIGLIT_PASS : PIGLIT_FAIL;
> +}
> +
> +void piglit_init(int argc, char **argv)
> +{
> +       piglit_require_extension("GL_EXT_framebuffer_object");
> +       piglit_require_extension("GL_ARB_texture_swizzle");
> +}
> --
> 1.9.2
>
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