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glgsg: Don't assume buffer clear is necessarily supported

This commit is contained in:
rdb 2026-01-20 18:54:51 +01:00
parent 71b83d8f4f
commit 9afb3140c8
1 changed files with 28 additions and 14 deletions
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42
panda/src/glstuff/glGraphicsStateGuardian_src.cxx
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@ -7794,24 +7794,38 @@ update_shader_buffer_data(ShaderBuffer *buffer, size_t start, size_t size,
_glMemoryBarrier(GL_BUFFER_UPDATE_BARRIER_BIT);
}
if (data != nullptr) {
if (_supports_dsa) {
#ifndef OPENGLES
if (_supports_dsa) {
if (data != nullptr) {
_glNamedBufferSubData(gbc->_index, start, size, data);
} else {
_glBindBuffer(GL_SHADER_STORAGE_BUFFER, gbc->_index);
_glBufferSubData(GL_SHADER_STORAGE_BUFFER, start, size, data);
_glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
_current_sbuffer_index = 0;
}
} else {
if (_supports_dsa) {
else if (_supports_clear_buffer) {
_glClearNamedBufferSubData(gbc->_index, GL_R8, start, size, GL_RED, GL_UNSIGNED_BYTE, nullptr);
} else {
_glBindBuffer(GL_SHADER_STORAGE_BUFFER, gbc->_index);
_glClearBufferSubData(GL_SHADER_STORAGE_BUFFER, GL_R8, start, size, GL_RED, GL_UNSIGNED_BYTE, nullptr);
_glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
_current_sbuffer_index = 0;
}
else {
void *null_data = calloc(1, size);
_glNamedBufferSubData(gbc->_index, start, size, null_data);
free(null_data);
}
} else
#endif
{
_glBindBuffer(GL_SHADER_STORAGE_BUFFER, gbc->_index);
if (data != nullptr) {
_glBufferSubData(GL_SHADER_STORAGE_BUFFER, start, size, data);
}
#ifndef OPENGLES
else if (_supports_clear_buffer) {
_glClearBufferSubData(GL_SHADER_STORAGE_BUFFER, GL_R8, start, size, GL_RED, GL_UNSIGNED_BYTE, nullptr);
}
#endif
else {
void *null_data = calloc(1, size);
_glBufferSubData(GL_SHADER_STORAGE_BUFFER, start, size, null_data);
free(null_data);
}
_glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
_current_sbuffer_index = 0;
}
report_my_gl_errors();