47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
#include "internal.h"
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void C3D_DrawElements(GPU_Primitive_t primitive, int count, int type, const void* indices)
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{
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C3D_Context* ctx = C3Di_GetContext();
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u32 pa = osConvertVirtToPhys(indices);
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u32 base = ctx->bufInfo.base_paddr;
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if (pa < base) return;
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C3Di_UpdateContext();
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// Set primitive type
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GPUCMD_AddMaskedWrite(GPUREG_PRIMITIVE_CONFIG, 2, primitive != GPU_TRIANGLES ? primitive : GPU_GEOMETRY_PRIM);
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// Start a new primitive (breaks off a triangle strip/fan)
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GPUCMD_AddWrite(GPUREG_RESTART_PRIMITIVE, 1);
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// Configure the index buffer
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GPUCMD_AddWrite(GPUREG_INDEXBUFFER_CONFIG, (pa - base) | (type << 31));
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// Number of vertices
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GPUCMD_AddWrite(GPUREG_NUMVERTICES, count);
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// First vertex
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GPUCMD_AddWrite(GPUREG_VERTEX_OFFSET, 0);
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// Enable triangle element drawing mode if necessary
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if (primitive == GPU_TRIANGLES)
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{
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GPUCMD_AddMaskedWrite(GPUREG_GEOSTAGE_CONFIG, 2, 0x100);
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GPUCMD_AddMaskedWrite(GPUREG_GEOSTAGE_CONFIG2, 2, 0x100);
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}
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// Enable drawing mode
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GPUCMD_AddMaskedWrite(GPUREG_START_DRAW_FUNC0, 1, 0);
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// Trigger element drawing
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GPUCMD_AddWrite(GPUREG_DRAWELEMENTS, 1);
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// Go back to configuration mode
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GPUCMD_AddMaskedWrite(GPUREG_START_DRAW_FUNC0, 1, 1);
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// Disable triangle element drawing mode if necessary
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if (primitive == GPU_TRIANGLES)
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{
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GPUCMD_AddMaskedWrite(GPUREG_GEOSTAGE_CONFIG, 2, 0);
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GPUCMD_AddMaskedWrite(GPUREG_GEOSTAGE_CONFIG2, 2, 0);
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}
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// Clear the post-vertex cache
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GPUCMD_AddWrite(GPUREG_VTX_FUNC, 1);
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GPUCMD_AddMaskedWrite(GPUREG_PRIMITIVE_CONFIG, 0x8, 0);
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GPUCMD_AddMaskedWrite(GPUREG_PRIMITIVE_CONFIG, 0x8, 0);
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C3Di_GetContext()->flags |= C3DiF_DrawUsed;
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}
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