obs-studio/libobs-opengl/gl-subsystem.h

/******************************************************************************
    Copyright (C) 2013 by Hugh Bailey <[email protected]>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/

#ifndef GL_SUBSYSTEM_H
#define GL_SUBSYSTEM_H

#include "util/darray.h"
#include "graphics/graphics.h"
#include "glew/include/GL/glew.h"
#include "gl-helpers.h"
#include "gl-exports.h"

struct gl_platform;
struct gl_windowinfo;

static inline GLint convert_gs_format(enum gs_color_format format)
{
	switch (format) {
	case GS_A8:          return GL_RGBA;
	case GS_R8:          return GL_RED;
	case GS_RGBA:        return GL_RGBA;
	case GS_BGRX:        return GL_BGR;
	case GS_BGRA:        return GL_BGRA;
	case GS_R10G10B10A2: return GL_RGBA;
	case GS_RGBA16:      return GL_RGBA;
	case GS_R16:         return GL_RED;
	case GS_RGBA16F:     return GL_RGBA;
	case GS_RGBA32F:     return GL_RGBA;
	case GS_RG16F:       return GL_RG;
	case GS_RG32F:       return GL_RG;
	case GS_R16F:        return GL_RED;
	case GS_R32F:        return GL_RED;
	case GS_DXT1:        return GL_RGB;
	case GS_DXT3:        return GL_RGBA;
	case GS_DXT5:        return GL_RGBA;
	default:             return 0;
	}
}

static inline GLint convert_gs_internal_format(enum gs_color_format format)
{
	switch (format) {
	case GS_A8:          return GL_R8; /* NOTE: use GL_TEXTURE_SWIZZLE_x */
	case GS_R8:          return GL_R8;
	case GS_RGBA:        return GL_RGBA;
	case GS_BGRX:        return GL_RGBA;
	case GS_BGRA:        return GL_RGBA;
	case GS_R10G10B10A2: return GL_RGB10_A2;
	case GS_RGBA16:      return GL_RGBA16;
	case GS_R16:         return GL_R16;
	case GS_RGBA16F:     return GL_RGBA16F;
	case GS_RGBA32F:     return GL_RGBA32F;
	case GS_RG16F:       return GL_RG16F;
	case GS_RG32F:       return GL_RG32F;
	case GS_R16F:        return GL_R16F;
	case GS_R32F:        return GL_R32F;
	case GS_DXT1:        return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
	case GS_DXT3:        return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
	case GS_DXT5:        return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
	default:             return 0;
	}
}

static inline GLenum convert_zstencil_format(enum gs_zstencil_format format)
{
	switch (format) {
	case GS_Z16:         return GL_DEPTH_COMPONENT16;
	case GS_Z24_S8:      return GL_DEPTH24_STENCIL8;
	case GS_Z32F:        return GL_DEPTH_COMPONENT32F;
	case GS_Z32F_S8X24:  return GL_DEPTH32F_STENCIL8;
	default:             return 0;
	}
}

static inline GLenum convert_shader_type(enum shader_type type)
{
	switch (type) {
	default:
	case SHADER_VERTEX: return GL_VERTEX_SHADER;
	case SHADER_PIXEL:  return GL_FRAGMENT_SHADER;
	}
}

static inline void convert_filter(enum gs_sample_filter filter,
		GLint *min_filter, GLint *mag_filter)
{
	switch (filter) {
	case GS_FILTER_ANISOTROPIC:
		*min_filter = GL_LINEAR_MIPMAP_LINEAR;
		*mag_filter = GL_LINEAR;
		break;
	default:
	case GS_FILTER_POINT:
		*min_filter = GL_NEAREST_MIPMAP_NEAREST;
		*mag_filter = GL_NEAREST;
		break;
	case GS_FILTER_LINEAR:
		*min_filter = GL_LINEAR_MIPMAP_LINEAR;
		*mag_filter = GL_LINEAR;
		break;
	case GS_FILTER_MIN_MAG_POINT_MIP_LINEAR:
		*min_filter = GL_NEAREST_MIPMAP_LINEAR;
		*mag_filter = GL_NEAREST;
		break;
	case GS_FILTER_MIN_POINT_MAG_LINEAR_MIP_POINT:
		*min_filter = GL_NEAREST_MIPMAP_NEAREST;
		*mag_filter = GL_LINEAR;
		break;
	case GS_FILTER_MIN_POINT_MAG_MIP_LINEAR:
		*min_filter = GL_NEAREST_MIPMAP_LINEAR;
		*mag_filter = GL_LINEAR;
		break;
	case GS_FILTER_MIN_LINEAR_MAG_MIP_POINT:
		*min_filter = GL_LINEAR_MIPMAP_NEAREST;
		*mag_filter = GL_NEAREST;
		break;
	case GS_FILTER_MIN_LINEAR_MAG_POINT_MIP_LINEAR:
		*min_filter = GL_LINEAR_MIPMAP_LINEAR;
		*mag_filter = GL_NEAREST;
		break;
	case GS_FILTER_MIN_MAG_LINEAR_MIP_POINT:
		*min_filter = GL_LINEAR_MIPMAP_NEAREST;
		*mag_filter = GL_LINEAR;
		break;
	}
}

static inline GLint convert_address_mode(enum gs_address_mode mode)
{
	switch (mode) {
	default:
	case GS_ADDRESS_WRAP:       return GL_REPEAT;
	case GS_ADDRESS_CLAMP:      return GL_CLAMP;
	case GS_ADDRESS_MIRROR:     return GL_MIRRORED_REPEAT;
	case GS_ADDRESS_BORDER:     return GL_CLAMP_TO_BORDER;
	case GS_ADDRESS_MIRRORONCE: return GL_MIRROR_CLAMP_EXT;
	}
}

extern void convert_sampler_info(struct gs_sampler *sampler,
		struct gs_sampler_info *info);

struct gs_sampler {
	GLint min_filter;
	GLint mag_filter;
	GLint address_u;
	GLint address_v;
	GLint address_w;
	GLint max_anisotropy;
};

struct shader_param {
	char                   *name;
	enum shader_param_type type;
	GLint                  param;
	GLint                  texture_id;
	size_t                 sampler_id;
	int                    array_count;

	struct gs_texture      *texture;

	DARRAY(uint8_t)        cur_value;
	DARRAY(uint8_t)        def_value;
	bool                   changed;
};

struct gs_shader {
	device_t         device;
	enum shader_type type;
	GLuint           program;

	struct shader_param *viewproj;
	struct shader_param *world;

	DARRAY(struct gs_sampler)   samplers;
	DARRAY(struct shader_param) params;
};

struct gs_texture {
	device_t             device;
	enum gs_texture_type type;
	enum gs_color_format format;
	GLenum               gl_format;
	GLint                gl_internal_format;
	GLuint               texture;
	uint32_t             levels;
	bool                 is_dynamic;
	bool                 is_render_target;
	bool                 gen_mipmaps;
};

struct gs_texture_2d {
	struct gs_texture    base;

	uint32_t             width;
	uint32_t             height;
	bool                 gen_mipmaps;
	GLuint               unpack_buffer;
};

struct gs_texture_cube {
	struct gs_texture    base;

	uint32_t             size;
};

struct gs_zstencil_buffer {
	device_t             device;
	GLuint               buffer;
	GLenum               format;
};

struct gs_swap_chain {
	device_t             device;
	struct gl_windowinfo *wi;
	struct gs_init_data  info;
};

struct gs_device {
	struct gl_platform   *plat;

	struct gs_texture    *cur_render_texture;
	int                  cur_render_side;
	struct gs_texture    *cur_textures[GS_MAX_TEXTURES];
	struct gs_sampler    *cur_samplers[GS_MAX_TEXTURES];
	struct gs_swap_chain *cur_swap;
};

extern struct gl_platform   *gl_platform_create(device_t device,
                                                struct gs_init_data *info);
extern struct gs_swap_chain *gl_platform_getswap(struct gl_platform *platform);
extern void                  gl_platform_destroy(struct gl_platform *platform);

extern struct gl_windowinfo *gl_windowinfo_create(struct gs_init_data *info);
extern void                  gl_windowinfo_destroy(struct gl_windowinfo *wi);

#endif