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GPU: Polyline must have at least two vertices 

Fixes GPU stream corruption in Lifeforce Tenka.
This commit is contained in:
Connor McLaughlin 2020-03-30 13:58:36 +10:00
parent eaf13a1461
commit 6bc91f2157
1 changed files with 5 additions and 4 deletions
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9
src/core/gpu_commands.cpp
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@ -118,7 +118,7 @@ bool GPU::HandleInterruptRequestCommand(const u32*& command_ptr, u32 command_siz
m_GPUSTAT.interrupt_request = true;
m_interrupt_controller->InterruptRequest(InterruptController::IRQ::GPU);
}
command_ptr++;
EndCommand();
return true;
@ -252,10 +252,11 @@ bool GPU::HandleRenderCommand(const u32*& command_ptr, u32 command_size)
words_per_vertex = 1 + BoolToUInt8(rc.shading_enable);
if (rc.polyline)
{
// polyline goes until we hit the termination code
num_vertices = 1;
// polyline must have at least two vertices, and the terminator is (word & 0xf000f000) == 0x50005000. terminator
// is on the first word for the vertex
num_vertices = 2;
bool found_terminator = false;
for (u32 pos = 2; pos < command_size; pos += words_per_vertex)
for (u32 pos = words_per_vertex * 2; pos < command_size; pos += words_per_vertex)
{
if ((command_ptr[pos] & UINT32_C(0xF000F000)) == UINT32_C(0x50005000))
{