New files

encoder/basisu_opencl.h

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+// basisu_opencl.h
+// Copyright (C) 2019-2021 Binomial LLC. All Rights Reserved.
+//
+// Note: Undefine or set BASISU_SUPPORT_OPENCL to 0 to completely OpenCL support.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+#include "../transcoder/basisu.h"
+#include "basisu_enc.h"
+#include "basisu_etc.h"
+
+namespace basisu
+{
+	bool opencl_init(bool force_serialization);
+	void opencl_deinit();
+	bool opencl_is_available();
+
+	struct opencl_context;
+
+	// Each thread calling OpenCL should have its own opencl_context_ptr. This corresponds to a OpenCL command queue. (Confusingly, we only use a single OpenCL device "context".)
+	typedef opencl_context* opencl_context_ptr;
+
+	opencl_context_ptr opencl_create_context();
+	void opencl_destroy_context(opencl_context_ptr context);
+
+#pragma pack(push, 1)
+	struct cl_pixel_block
+	{
+		color_rgba m_pixels[16]; // [y*4+x]
+	};
+#pragma pack(pop)
+
+	// Must match BASISU_ETC1_CLUSTER_FIT_ORDER_TABLE_SIZE
+	const uint32_t OPENCL_ENCODE_ETC1S_MAX_PERMS = 165;
+
+	bool opencl_set_pixel_blocks(opencl_context_ptr pContext, uint32_t total_blocks, const cl_pixel_block* pPixel_blocks);
+
+	bool opencl_encode_etc1s_blocks(opencl_context_ptr pContext, etc_block* pOutput_blocks, bool perceptual, uint32_t total_perms);
+
+	// opencl_encode_etc1s_pixel_clusters
+
+#pragma pack(push, 1)
+	struct cl_pixel_cluster
+	{
+		uint64_t m_total_pixels;
+		uint64_t m_first_pixel_index;
+	};
+#pragma pack(pop)
+
+	bool opencl_encode_etc1s_pixel_clusters(
+		opencl_context_ptr pContext,
+		etc_block* pOutput_blocks, 
+		uint32_t total_clusters,
+		const cl_pixel_cluster *pClusters,
+		uint64_t total_pixels,
+		const color_rgba *pPixels,
+		const uint32_t *pPixel_weights,
+		bool perceptual, uint32_t total_perms);
+
+	// opencl_refine_endpoint_clusterization
+
+#pragma pack(push, 1)
+	struct cl_block_info_struct
+	{
+		uint16_t m_first_cluster_ofs;
+		uint16_t m_num_clusters;
+		uint16_t m_cur_cluster_index;
+		uint8_t m_cur_cluster_etc_inten;
+	};
+
+	struct cl_endpoint_cluster_struct
+	{
+		color_rgba m_unscaled_color;
+		uint8_t m_etc_inten;
+		uint16_t m_cluster_index;
+	};
+#pragma pack(pop)
+
+	bool opencl_refine_endpoint_clusterization(
+		opencl_context_ptr pContext,
+		const cl_block_info_struct *pPixel_block_info,
+		uint32_t total_clusters,
+		const cl_endpoint_cluster_struct *pCluster_info,
+		const uint32_t *pSorted_block_indices,
+		uint32_t* pOutput_cluster_indices, 
+		bool perceptual);
+
+	// opencl_find_optimal_selector_clusters_for_each_block
+
+#pragma pack(push, 1)
+	struct fosc_selector_struct
+	{
+		uint32_t m_packed_selectors;	// 4x4 grid of 2-bit selectors
+	};
+
+	struct fosc_block_struct
+	{
+		color_rgba m_etc_color5_inten;  // unscaled 5-bit block color in RGB, alpha has block's intensity index
+		uint32_t m_first_selector;		// offset into selector table
+		uint32_t m_num_selectors;		// number of selectors to check
+	};
+
+	struct fosc_param_struct
+	{
+		uint32_t m_total_blocks;
+		int m_perceptual;
+	};
+#pragma pack(pop)
+
+	bool opencl_find_optimal_selector_clusters_for_each_block(
+		opencl_context_ptr pContext,
+		const fosc_block_struct* pInput_block_info,	// one per block
+		uint32_t total_input_selectors,
+		const fosc_selector_struct* pInput_selectors,
+		const uint32_t* pSelector_cluster_indices,
+		uint32_t* pOutput_selector_cluster_indices, // one per block
+		bool perceptual);
+
+#pragma pack(push, 1)
+	struct ds_param_struct
+	{
+		uint32_t m_total_blocks;
+		int m_perceptual;
+	};
+#pragma pack(pop)
+
+	bool opencl_determine_selectors(
+		opencl_context_ptr pContext,
+		const color_rgba* pInput_etc_color5_and_inten,
+		etc_block* pOutput_blocks,
+		bool perceptual);
+
+} // namespace basisu

encoder/pvpngreader.h

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+// pngreader.h - Public Domain - see unlicense at bottom of pvpngreader.cpp
+#pragma once
+#include <stdint.h>
+
+namespace pv_png
+{
+	// PNG color types
+	enum
+	{
+		PNG_COLOR_TYPE_GREYSCALE = 0,
+		PNG_COLOR_TYPE_TRUECOLOR = 2,
+		PNG_COLOR_TYPE_PALETTIZED = 3,
+		PNG_COLOR_TYPE_GREYSCALE_ALPHA = 4,
+		PNG_COLOR_TYPE_TRUECOLOR_ALPHA = 6
+	};
+
+	// PNG file description
+	struct png_info
+	{
+		uint32_t m_width;
+		uint32_t m_height;
+				
+		uint32_t m_num_chans;	// The number of channels, factoring in transparency. Ranges from [1-4].
+
+		uint32_t m_bit_depth;	// PNG ihdr bit depth: 1, 2, 4, 8 or 16
+		uint32_t m_color_type;	// PNG ihdr color type, PNG_COLOR_TYPE_GRAYSCALE etc.
+
+		bool m_has_gamma;		// true if the PNG file had a GAMA chunk
+		uint32_t m_gamma_value; // PNG GAMA chunk value, scaled by 100000
+
+		bool m_has_trns;		// true if the PNG file used colorkey transparency
+	};
+
+	// Retrieved information about the PNG file.
+	// Returns false on any errors.
+	bool get_png_info(const void* pImage_buf, size_t buf_size, png_info& info);
+
+	// Input parameters:
+	// pImage_buf, buf_size - pointer to PNG image data
+	// desired_chans - desired number of output channels. 0=auto, 1=grayscale, 2=grayscale alpha, 3=24bpp RGB, 4=32bpp RGBA
+	//
+	// Output parameters:
+	// width, height - PNG image resolution
+	// num_chans - actual number of channels in PNG, from [1,4] (factoring in transparency)
+	//
+	// Returns nullptr on any errors.
+	void* load_png(const void* pImage_buf, size_t buf_size, uint32_t desired_chans, uint32_t &width, uint32_t &height, uint32_t& num_chans);
+}