GPU: Fixed the index offset rendering, and implemented the base vertex functionality.
This fixes Stardew Valley.
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@ -412,12 +412,14 @@ void RasterizerOpenGL::DrawArrays() {
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const GLenum primitive_mode{MaxwellToGL::PrimitiveTopology(regs.draw.topology)};
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if (is_indexed) {
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const GLint index_min{static_cast<GLint>(regs.index_array.first)};
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const GLint index_max{static_cast<GLint>(regs.index_array.first + regs.index_array.count)};
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glDrawRangeElementsBaseVertex(primitive_mode, index_min, index_max, regs.index_array.count,
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MaxwellToGL::IndexFormat(regs.index_array.format),
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reinterpret_cast<const void*>(index_buffer_offset),
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-index_min);
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const GLint base_vertex{static_cast<GLint>(regs.vb_element_base)};
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// Adjust the index buffer offset so it points to the first desired index.
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index_buffer_offset += regs.index_array.first * regs.index_array.FormatSizeInBytes();
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glDrawElementsBaseVertex(primitive_mode, regs.index_array.count,
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MaxwellToGL::IndexFormat(regs.index_array.format),
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reinterpret_cast<const void*>(index_buffer_offset), base_vertex);
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} else {
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glDrawArrays(primitive_mode, 0, regs.vertex_buffer.count);
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}
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