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Align Scan to be a multiple of four bytes

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Some GPUs (e.g. r600) require the stride of vertex attributes to be a
multiple of four bytes, add two bytes of padding to the Scan struct to
meet this alignment requirement and reduce driver CPU overhead.
This commit is contained in:
Icecream95 2022-08-29 16:24:58 +12:00
parent d57464a02a
commit 0499dbd4cf
2 changed files with 10 additions and 1 deletions
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5
Outputs/OpenGL/ScanTargetGLSLFragments.cpp
View File

@ -84,6 +84,11 @@ void ScanTarget::enable_vertex_attributes(ShaderType type, Shader &target) {
Scan test_scan;
Line test_line;
// Some GPUs require alignment and will need to copy vertex data to a
// shadow buffer otherwise
static_assert(sizeof(Scan) % 4 == 0);
static_assert(sizeof(Line) % 4 == 0);
switch(type) {
case ShaderType::Composition:
for(int c = 0; c < 2; ++c) {

6
Outputs/ScanTarget.hpp
View File

@ -304,7 +304,11 @@ struct ScanTarget {
/// For composite video, dictates the amplitude of the colour subcarrier as a proportion of
/// the whole, as determined from the colour burst. Will be 0 if there was no colour burst.
uint8_t composite_amplitude;
union {
uint8_t composite_amplitude;
uint32_t padding;
};
};
/// Requests a new scan to populate.