[Piglit] [PATCH] arb_texture_buffer_range: Fix buffer alignment in ranges-2 test

[Anthony Pesch]

From: Anthony Pesch <ape...@nvidia.com>

The ranges-2 test was failing due to glTexBufferRange returning GL_INVALID_VALUE
when the offset parameter wasn't GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT byte 
aligned.

From the OpenGL 4.6 Core spec:

An INVALID_VALUE error is generated if offset is not an integer multiple of the
value of TEXTURE_BUFFER_OFFSET_ALIGNMENT.
---
 .../spec/arb_texture_buffer_range/ranges-2.c  | 24 +++++++++++++++----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/tests/spec/arb_texture_buffer_range/ranges-2.c 
b/tests/spec/arb_texture_buffer_range/ranges-2.c
index 3477e4b52..b9cd543b0 100644
--- a/tests/spec/arb_texture_buffer_range/ranges-2.c
+++ b/tests/spec/arb_texture_buffer_range/ranges-2.c
@@ -91,22 +91,25 @@ float data[] = {
        0, 0,           0.5, 0,
 };
 
+int aligned_size = 0;
+int chunk_size = 24 * sizeof(float);
+int num_chunks = 4;
+
 enum piglit_result
 piglit_display(void) {
        int i;
-       int chunk_size = 24 * sizeof(float);
        bool pass = true;
 
        glClearColor(0.2, 0.2, 0.2, 0.2);
        glClear(GL_COLOR_BUFFER_BIT);
 
-       for (i = 0; i < sizeof(data) / chunk_size; i++) {
+       for (i = 0; i < num_chunks; i++) {
                glTexBufferRange(GL_TEXTURE_BUFFER, GL_RGBA32F,
-                                tbo, i * chunk_size, chunk_size);
+                                tbo, i * aligned_size, chunk_size);
                glDrawArrays(GL_TRIANGLES, 0, 6);
        }
 
-       for (i = 0; i < sizeof(data) / chunk_size; i++) {
+       for (i = 0; i < num_chunks; i++) {
                float c[4] = {
                        data[i * 24 + 2],
                        data[i * 24 + 3],
@@ -128,8 +131,14 @@ piglit_display(void) {
 
 void
 piglit_init(int argc, char **argv) {
+       GLint align, i;
+       uint8_t *chunk;
+
        piglit_require_extension("GL_ARB_texture_buffer_range");
 
+       glGetIntegerv(GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT, &align);
+       aligned_size = chunk_size % align == 0 ? chunk_size : align;
+
        prog = piglit_build_simple_program(vs_source, fs_source);
        glUseProgram(prog);
 
@@ -138,7 +147,12 @@ piglit_init(int argc, char **argv) {
 
        glGenBuffers(1, &tbo);
        glBindBuffer(GL_ARRAY_BUFFER, tbo);
-       glBufferData(GL_ARRAY_BUFFER, sizeof(data), data, GL_STATIC_DRAW);
+       glBufferData(GL_ARRAY_BUFFER, aligned_size * num_chunks, NULL, 
GL_STATIC_DRAW);
+
+       for (i = 0, chunk = data; i < num_chunks; i++) {
+               glBufferSubData(GL_ARRAY_BUFFER, aligned_size * i, chunk_size, 
chunk);
+               chunk += chunk_size;
+       }
 
        glGenTextures(1, &tex);
        glBindTexture(GL_TEXTURE_BUFFER, tex);
-- 
2.19.2

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