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

[Pierre-Eric Pelloux-Prayer]

Hi,

The patch looks good, except ranges-2.c now cause a compiler warning:

tests/spec/arb_texture_buffer_range/ranges-2.c:152:20: warning: assignment to ‘uint8_t *’ {aka ‘unsigned char *’} from incompatible pointer type ‘float *’ [-Wincompatible-pointer-types]
  for (i = 0, chunk = data; i < num_chunks; i++) {

Another suggestion: it could be interesting to verify that INVALID_VALUE is generated when the alignment constraint is not respected.

Thanks,

Pierre-Eric




On 09/05/2019 20:41, Anthony Pesch wrote:
> Pinging to see if anyone has the time to review.
> 
>  - Anthony
> 
> On 4/15/19 4:24 PM, Anthony Pesch wrote:
>> From: Anthony Pesch <apesch at 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);
>>
> _______________________________________________
> Piglit mailing list
> Piglit at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/piglit