Combine render functions into single gpu_render()

gpu.c

@@ -795,8 +795,6 @@ void gpu_init(gpu_ctx_t *ctx, GLFWwindow *window, const char *name)
 	    ctx->dev, &transient_cmd_pool_config, nullptr,
 	    &ctx->transient_cmd_pool);
 	assert(result == VK_SUCCESS);
-
-	ctx->active_img_index = UINT32_MAX;
 }
 
 void gpu_cleanup(const gpu_ctx_t *ctx)
@@ -957,7 +955,10 @@ void gpu_model_cleanup(const gpu_ctx_t *ctx, const gpu_model_t *model)
 	vkFreeMemory(ctx->dev, model->vertex_mem, nullptr);
 }
 
-void gpu_render_begin(gpu_ctx_t *ctx, vp_t vp)
+void gpu_render(
+    const gpu_ctx_t *ctx, vp_t vp, size_t model_count,
+    const gpu_model_t *models, const mat4_t **bone_matrices,
+    const mat4_t *model_transforms)
 {
 	VkResult result;
 
@@ -966,9 +967,10 @@ void gpu_render_begin(gpu_ctx_t *ctx, vp_t vp)
 	vkResetFences(ctx->dev, 1, &ctx->in_flight);
 
 	// Aquire image from swapchain
+	uint32_t curr_img;
 	result = vkAcquireNextImageKHR(
 	    ctx->dev, ctx->swapchain, UINT64_MAX, ctx->img_avail, VK_NULL_HANDLE,
-	    &ctx->active_img_index);
+	    &curr_img);
 	assert(result == VK_SUCCESS);
 
 	// Reset command buffer, then begin writing
@@ -986,7 +988,7 @@ void gpu_render_begin(gpu_ctx_t *ctx, vp_t vp)
 	VkRenderPassBeginInfo render_pass_begin = {
 		.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO,
 		.renderPass = ctx->render_pass,
-		.framebuffer = ctx->framebuffers[ctx->active_img_index],
+		.framebuffer = ctx->framebuffers[curr_img],
 		.renderArea.extent = ctx->swapchain_extent,
 		.clearValueCount = 2,
 		.pClearValues = clear_values,
@@ -1002,40 +1004,31 @@ void gpu_render_begin(gpu_ctx_t *ctx, vp_t vp)
 	    0, sizeof(vp_t), &vp);
 	vkCmdDraw(ctx->cmd_buf, 4, 1, 0, 0);
 
+	// Draw models
 	vkCmdBindPipeline(
 	    ctx->cmd_buf, VK_PIPELINE_BIND_POINT_GRAPHICS, ctx->model_pipeline);
 	vkCmdPushConstants(
 	    ctx->cmd_buf, ctx->model_pipeline_layout, VK_SHADER_STAGE_VERTEX_BIT,
 	    0, sizeof(vp_t), &vp);
-}
-
-void gpu_render_model(
-    const gpu_ctx_t *ctx, const gpu_model_t *model,
-    const mat4_t *bone_matrices, mat4_t transform)
-{
-	assert(ctx->active_img_index < ctx->swapchain_img_count);
-
-	model->transform_ptr[ctx->active_img_index] = transform;
+	for (unsigned i = 0; i < model_count; ++i) {
+		models[i].transform_ptr[curr_img] = model_transforms[i];
 		memcpy(
-	    model->bone_ptr + (model->bone_count * ctx->active_img_index),
-	    bone_matrices, model->bone_count * sizeof(mat4_t));
+		    models[i].bone_ptr + (models[i].bone_count * curr_img),
+		    bone_matrices[i], models[i].bone_count * sizeof(mat4_t));
 
 		vkCmdBindVertexBuffers(
-	    ctx->cmd_buf, 0, 1, &model->vertex_buf, &(VkDeviceSize) { 0 });
+		    ctx->cmd_buf, 0, 1, &models[i].vertex_buf,
+		    &(VkDeviceSize) { 0 });
 		vkCmdBindIndexBuffer(
-	    ctx->cmd_buf, model->index_buf, 0, VK_INDEX_TYPE_UINT16);
+		    ctx->cmd_buf, models[i].index_buf, 0, VK_INDEX_TYPE_UINT16);
 
 		vkCmdBindDescriptorSets(
 		    ctx->cmd_buf, VK_PIPELINE_BIND_POINT_GRAPHICS,
-	    ctx->model_pipeline_layout, 0, 1,
-	    model->desc_sets + ctx->active_img_index, 0, nullptr);
+		    ctx->model_pipeline_layout, 0, 1, models[i].desc_sets + curr_img,
+		    0, nullptr);
 
-	vkCmdDrawIndexed(ctx->cmd_buf, model->index_count, 1, 0, 0, 0);
-}
-
-void gpu_render_submit(gpu_ctx_t *ctx)
-{
-	VkResult result;
+		vkCmdDrawIndexed(ctx->cmd_buf, models[i].index_count, 1, 0, 0, 0);
+	}
 
 	// Finish render pass and end writing to command buffer
 	vkCmdEndRenderPass(ctx->cmd_buf);
@@ -1065,10 +1058,8 @@ void gpu_render_submit(gpu_ctx_t *ctx)
 		.pWaitSemaphores = &ctx->render_fin,
 		.swapchainCount = 1,
 		.pSwapchains = &ctx->swapchain,
-		.pImageIndices = &ctx->active_img_index,
+		.pImageIndices = &curr_img,
 	};
 	result = vkQueuePresentKHR(ctx->queue, &present_info);
 	assert(result == VK_SUCCESS);
-
-	ctx->active_img_index = UINT32_MAX;
 }

gpu.h

@@ -47,7 +47,6 @@ typedef struct {
 	VkDeviceMemory staging_mem;
 	void *staging_ptr;
 	VkCommandPool transient_cmd_pool;
-	uint32_t active_img_index;
 } gpu_ctx_t;
 
 typedef struct {
@@ -73,10 +72,9 @@ void gpu_model_load(
     const gpu_ctx_t *ctx, const model_t *model, gpu_model_t *out);
 void gpu_model_cleanup(const gpu_ctx_t *ctx, const gpu_model_t *model);
 
-void gpu_render_begin(gpu_ctx_t *ctx, vp_t vp);
-void gpu_render_model(
-    const gpu_ctx_t *ctx, const gpu_model_t *model,
-    const mat4_t *bone_matrices, mat4_t transform);
-void gpu_render_submit(gpu_ctx_t *ctx);
+void gpu_render(
+    const gpu_ctx_t *ctx, vp_t vp, size_t model_count,
+    const gpu_model_t *models, const mat4_t **bone_matrices,
+    const mat4_t *model_transforms);
 
 #endif

main.c

@@ -52,13 +52,10 @@ int main(int argc, char *argv[])
 
 	// Initialise GPU and load model
 	gpu_ctx_t gpu;
-	gpu_model_t gpu_model1, gpu_model2;
+	gpu_model_t gpu_models[2];
 	gpu_init(&gpu, window, "Foo");
-	gpu_model_load(&gpu, &model, &gpu_model1);
-	gpu_model_load(&gpu, &model, &gpu_model2);
-
-	// Initialise animation
-	animation_state_t anim = animation_init(&model);
+	gpu_model_load(&gpu, &model, gpu_models + 0);
+	gpu_model_load(&gpu, &model, gpu_models + 1);
 
 	const vec3_t cam = { 0, 4, -8 };
 	const vec3_t tgt = { 0, 0, 0 };
@@ -66,15 +63,16 @@ int main(int argc, char *argv[])
 		.view = mat4_lookat(cam, tgt, (vec3_t) { 0, 1, 0 }),
 		.proj = mat4_perspective((float)W / H, PI / 8, 0.1, 100.0),
 	};
-	mat4_t transform1 = mat4_mul(
+	mat4_t transforms[] = {
+		mat4_mul(
 		    MAT4_TRANSLATE(1, 0, 0),
 		    (mat4_t) {
 		        { 0, 0, -1, 0 },
 		        { -1, 0, 0, 0 },
 		        { 0, 1, 0, 0 },
 		        { 0, 0, 0, 1 },
-	    });
-	mat4_t transform2 = mat4_mul(
+		    }),
+		mat4_mul(
 		    MAT4_TRANSLATE(2, 0, 0),
 		    mat4_mul(
 		        MAT4_ROTATE_Y(PI),
@@ -83,29 +81,30 @@ int main(int argc, char *argv[])
 		            { -1, 0, 0, 0 },
 		            { 0, 1, 0, 0 },
 		            { 0, 0, 0, 1 },
-	        }));
+		        })),
+	};
 
-	const mat4_t rot1 = MAT4_ROTATE_Y(PI / 170);
-	const mat4_t rot2 = MAT4_ROTATE_Y(-PI / 340);
+	// Set up animation
+	animation_state_t anim = animation_init(&model);
 	animation_start(&anim, &model, 0);
 
 	while (!glfwWindowShouldClose(window)) {
 		glfwPollEvents();
 
-		transform1 = mat4_mul(rot1, transform1);
-		transform2 = mat4_mul(rot2, transform2);
+		transforms[0] = mat4_mul(MAT4_ROTATE_Y(PI / 170), transforms[0]);
+		transforms[1] = mat4_mul(MAT4_ROTATE_Y(-PI / 340), transforms[1]);
+
 		animation_update(&anim, &model, DT);
 
-		gpu_render_begin(&gpu, vp);
-		gpu_render_model(&gpu, &gpu_model1, anim.bone_matrices, transform1);
-		gpu_render_model(&gpu, &gpu_model2, anim.bone_matrices, transform2);
-		gpu_render_submit(&gpu);
+		const mat4_t *bone_matrices[]
+		    = { anim.bone_matrices, anim.bone_matrices };
+		gpu_render(&gpu, vp, 2, gpu_models, bone_matrices, transforms);
 	}
 
 	// Clean up
 	animation_cleanup(&anim);
-	gpu_model_cleanup(&gpu, &gpu_model1);
-	gpu_model_cleanup(&gpu, &gpu_model2);
+	gpu_model_cleanup(&gpu, gpu_models + 0);
+	gpu_model_cleanup(&gpu, gpu_models + 1);
 	gpu_cleanup(&gpu);
 	model_cleanup(&model);
 	glfwDestroyWindow(window);