Function DrawFrame

source/graphics.cpp:397–546

// ***********************************************************************

void DrawFrame(i32 w, i32 h) {
	// TODO: Sort the draw list to minimise state changes

	// Update the global vertex buffer
	if (pRenderState->perFrameVertexBuffer.count > 0) {
		sg_range vtxData;
		vtxData.ptr = (void*)pRenderState->perFrameVertexBuffer.pData;
		vtxData.size = pRenderState->perFrameVertexBuffer.count * sizeof(VertexData);
		sg_update_buffer(pRenderState->transientVertexBuffer, &vtxData);
	}

	if (pRenderState->perFrameIndexBuffer.count > 0) {
		sg_range idxData;
		idxData.ptr = (void*)pRenderState->perFrameIndexBuffer.pData;
		idxData.size = pRenderState->perFrameIndexBuffer.count * sizeof(u16);
		sg_update_buffer(pRenderState->transientIndexBuffer, &idxData);
	}

	// Draw 3D view into texture
	{
		sg_begin_pass(&pRenderState->passCore3DScene);

		sg_apply_viewport(0, 0, (i32)pRenderState->targetResolution.x, (i32)pRenderState->targetResolution.y, true);
		sg_apply_scissor_rect(0, 0, (i32)pRenderState->targetResolution.x, (i32)pRenderState->targetResolution.y, true);

		for(i32 i = 0; i < pRenderState->drawList3D.count; i++) {
			DrawCommand& cmd = pRenderState->drawList3D[i];

			sg_pipeline& pipeline = GetPipeline(cmd.indexedDraw, cmd.type, false, cmd.cullMode);
			sg_apply_pipeline(pipeline);
			
			sg_bindings bind{0};
			bind.vertex_buffers[0] = pRenderState->transientVertexBuffer;
			bind.fs = {
				.images = { pRenderState->whiteTexture },
				.samplers = { pRenderState->samplerNearest }
			};

			if (cmd.indexedDraw) {
				bind.index_buffer = pRenderState->transientIndexBuffer;
				bind.index_buffer_offset = cmd.indexBufferOffset;
			}

			if (cmd.texturedDraw) {
				bind.fs.images[0] = cmd.texture;
			}

			sg_range vsUniforms = SG_RANGE_REF(cmd.vsUniforms);
			sg_apply_uniforms(SG_SHADERSTAGE_VS, 0, &vsUniforms);
			sg_range fsUniforms = SG_RANGE_REF(cmd.fsUniforms);
			sg_apply_uniforms(SG_SHADERSTAGE_FS, 0, &fsUniforms);

			bind.vertex_buffer_offsets[0] = cmd.vertexBufferOffset;
			sg_apply_bindings(&bind);
			sg_draw(0, cmd.numElements, 1); 
		}
		sg_end_pass();
	}