Differential D5570 Diff 17646 source/blender/gpu/intern/gpu_immediate.c

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source/blender/gpu/intern/gpu_immediate.c

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	uint16_t prev_enabled_attr_bits; /* <-- only affects this VAO, so we're ok */	uint16_t prev_enabled_attr_bits; /* <-- only affects this VAO, so we're ok */
	} Immediate;	} Immediate;

	/* size of internal buffer -- make this adjustable? */	/* size of internal buffer */
	#define IMM_BUFFER_SIZE (4 * 1024 * 1024)	#define DEFAULT_INTERNAL_BUFFER_SIZE (4 * 1024 * 1024)
		static uint imm_buffer_size = DEFAULT_INTERNAL_BUFFER_SIZE;

	static bool initialized = false;	static bool initialized = false;
	static Immediate imm;	static Immediate imm;
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	imm.vbo_id = GPU_buf_alloc();	imm.vbo_id = GPU_buf_alloc();
	glBindBuffer(GL_ARRAY_BUFFER, imm.vbo_id);	glBindBuffer(GL_ARRAY_BUFFER, imm.vbo_id);
	glBufferData(GL_ARRAY_BUFFER, IMM_BUFFER_SIZE, NULL, GL_DYNAMIC_DRAW);	glBufferData(GL_ARRAY_BUFFER, imm_buffer_size, NULL, GL_DYNAMIC_DRAW);

	imm.prim_type = GPU_PRIM_NONE;	imm.prim_type = GPU_PRIM_NONE;
	imm.strict_vertex_len = true;	imm.strict_vertex_len = true;
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	/* how many bytes do we need for this draw call? */	/* how many bytes do we need for this draw call? */
	const uint bytes_needed = vertex_buffer_size(&imm.vertex_format, vertex_len);	const uint bytes_needed = vertex_buffer_size(&imm.vertex_format, vertex_len);

	#if TRUST_NO_ONE
	assert(bytes_needed <= IMM_BUFFER_SIZE);
	#endif

	glBindBuffer(GL_ARRAY_BUFFER, imm.vbo_id);	glBindBuffer(GL_ARRAY_BUFFER, imm.vbo_id);

	/* does the current buffer have enough room? */	/* does the current buffer have enough room? */
	const uint available_bytes = IMM_BUFFER_SIZE - imm.buffer_offset;	const uint available_bytes = imm_buffer_size - imm.buffer_offset;
	/* ensure vertex data is aligned */

		bool recreate_buffer = false;
		if (bytes_needed > imm_buffer_size) {
		/* expand the internal buffer */
		imm_buffer_size = bytes_needed;
		recreate_buffer = true;
		}
		else if (bytes_needed < DEFAULT_INTERNAL_BUFFER_SIZE &&
		imm_buffer_size > DEFAULT_INTERNAL_BUFFER_SIZE) {
		/* shrink the internal buffer */
		imm_buffer_size = DEFAULT_INTERNAL_BUFFER_SIZE;
		recreate_buffer = true;
		}

		/* ensure vertex data is aligned */
	/* Might waste a little space, but it's safe. */	/* Might waste a little space, but it's safe. */
	const uint pre_padding = padding(imm.buffer_offset, imm.vertex_format.stride);	const uint pre_padding = padding(imm.buffer_offset, imm.vertex_format.stride);

	if ((bytes_needed + pre_padding) <= available_bytes) {	if (!recreate_buffer && ((bytes_needed + pre_padding) <= available_bytes)) {
	imm.buffer_offset += pre_padding;	imm.buffer_offset += pre_padding;
	}	}
	else {	else {
	/* orphan this buffer & start with a fresh one */	/* orphan this buffer & start with a fresh one */
	/* this method works on all platforms, old & new */	/* this method works on all platforms, old & new */
	glBufferData(GL_ARRAY_BUFFER, IMM_BUFFER_SIZE, NULL, GL_DYNAMIC_DRAW);	glBufferData(GL_ARRAY_BUFFER, imm_buffer_size, NULL, GL_DYNAMIC_DRAW);

	imm.buffer_offset = 0;	imm.buffer_offset = 0;
	}	}
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