Attachment 116319 Details for Bug 89314 – Example showing the error with GL_R16 to unsigned byte

Example showing the error with GL_R16 to unsigned byte

test_r16.c (text/plain), 2.44 KB, created by Neil Roberts on 2015-06-05 13:09:16 UTC

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Creator: Neil Roberts

Created: 2015-06-05 13:09:16 UTC

Size: 2.44 KB

patch

obsolete

>#include <stdio.h>
>#include <stdbool.h>
>#include <epoxy/gl.h>
>#include <GL/freeglut.h>
>#include <math.h>
>#include <stdio.h>
>
>#define ARRAY_SIZE(ary) (sizeof(ary) / sizeof((ary)[0]))
>
>static void
>test_r16(void)
>{
>        GLushort buf[65536];
>        GLubyte without_pbo[65536], with_pbo[65536];
>        GLuint i;
>        GLuint tex;
>        GLuint pbo;
>        float expected;
>        GLuint expected_int;
>
>        for (i = 0; i < ARRAY_SIZE(buf); i++)
>                buf[i] = i;
>
>        glGenTextures(1, &tex);
>        glBindTexture(GL_TEXTURE_2D, tex);
>        glTexImage2D(GL_TEXTURE_2D,
>                     0, /* level */
>                     GL_R16,
>                     256, 256, /* width/height */
>                     0, /* border */
>                     GL_RED,
>                     GL_UNSIGNED_SHORT,
>                     buf);
>        glGetTexImage(GL_TEXTURE_2D,
>                      0, /* level */
>                      GL_RED,
>                      GL_UNSIGNED_BYTE,
>                      without_pbo);
>
>        glGenBuffers(1, &pbo);
>        glBindBuffer(GL_PIXEL_PACK_BUFFER, pbo);
>        glBufferData(GL_PIXEL_PACK_BUFFER,
>                     sizeof without_pbo,
>                     NULL, /* data */
>                     GL_STATIC_READ);
>        glGetTexImage(GL_TEXTURE_2D,
>                      0, /* level */
>                      GL_RED,
>                      GL_UNSIGNED_BYTE,
>                      NULL);
>        glGetBufferSubData(GL_PIXEL_PACK_BUFFER,
>                           0, /* offset */
>                           sizeof with_pbo,
>                           with_pbo);
>        glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
>        glDeleteBuffers(1, &pbo);
>
>        for (i = 0; i < ARRAY_SIZE(buf); i++) {
>                expected = i * 255.0f / 65535.0f;
>                expected_int = roundf(expected);
>                if (expected_int != without_pbo[i] ||
>                    expected_int != with_pbo[i]) {
>                        printf("source_value=%i float=%f expected=%i "
>                               "without_pbo=%i with_pbo=%i\n",
>                               i,
>                               expected,
>                               expected_int,
>                               without_pbo[i],
>                               with_pbo[i]);
>                }
>        }
>}
>
>int
>main(int argc, char **argv)
>{
>        glutInit(&argc, argv);
>        glutCreateWindow("GL_R16 to unsigned byte test");
>
>        test_r16();
>
>        return EXIT_SUCCESS;
>}

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Attachments on bug 89314: 113822 | 113823 | 113835 | 116319 | 116331

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