add GL initialization code for windows (so I can have something to test more easily with)

libobs-opengl/gl-exports.h

+#ifndef GS_GLEXPORTS
+#define GS_GLEXPORTS
+
+#include "util/c99defs.h"
+
+EXPORT device_t device_create(struct gs_init_data *data);
+EXPORT void device_destroy(device_t device);
+EXPORT swapchain_t device_create_swapchain(device_t device,
+		struct gs_init_data *data);
+EXPORT void device_resize(device_t device, uint32_t x, uint32_t y);
+EXPORT void device_getsize(device_t device, uint32_t *x, uint32_t *y);
+EXPORT uint32_t device_getwidth(device_t device);
+EXPORT uint32_t device_getheight(device_t device);
+EXPORT texture_t device_create_texture(device_t device, uint32_t width,
+		uint32_t height, enum gs_color_format color_format, void *data,
+		uint32_t flags);
+EXPORT texture_t device_create_cubetexture(device_t device, uint32_t size,
+		enum gs_color_format color_format, void *data[6],
+		uint32_t flags);
+EXPORT texture_t device_create_volumetexture(device_t device, uint32_t width,
+		uint32_t height, uint32_t depth,
+		enum gs_color_format color_format, void *data, uint32_t flags);
+EXPORT zstencil_t device_create_zstencil(device_t device, uint32_t width,
+		uint32_t height, enum gs_zstencil_format format);
+EXPORT stagesurf_t device_create_stagesurface(device_t device, uint32_t width,
+		uint32_t height, enum gs_color_format color_format);
+EXPORT samplerstate_t device_create_samplerstate(device_t device,
+		struct gs_sampler_info *info);
+EXPORT shader_t device_create_vertexshader(device_t device,
+		const char *shader, const char *file,
+		char **error_string);
+EXPORT shader_t device_create_pixelshader(device_t device,
+		const char *shader, const char *file,
+		char **error_string);
+EXPORT vertbuffer_t device_create_vertexbuffer(device_t device,
+		struct vb_data *data, uint32_t flags);
+EXPORT indexbuffer_t device_create_indexbuffer(device_t device,
+		enum gs_index_type type, void *indices, size_t num,
+		uint32_t flags);
+EXPORT enum gs_texture_type device_gettexturetype(device_t device,
+		texture_t texture);
+EXPORT void device_load_vertexbuffer(device_t device, vertbuffer_t vertbuffer);
+EXPORT void device_load_indexbuffer(device_t device, indexbuffer_t indexbuffer);
+EXPORT void device_load_texture(device_t device, texture_t tex, int unit);
+EXPORT void device_load_cubetexture(device_t device, texture_t cubetex,
+		int unit);
+EXPORT void device_load_volumetexture(device_t device, texture_t voltex,
+		int unit);
+EXPORT void device_load_samplerstate(device_t device,
+		samplerstate_t samplerstate, int unit);
+EXPORT void device_load_vertexshader(device_t device, shader_t vertshader);
+EXPORT void device_load_pixelshader(device_t device, shader_t pixelshader);
+EXPORT void device_load_defaultsamplerstate(device_t device, bool b_3d,
+		int unit);
+EXPORT shader_t device_getvertexshader(device_t device);
+EXPORT shader_t device_getpixelshader(device_t device);
+EXPORT texture_t device_getrendertarget(device_t device);
+EXPORT zstencil_t device_getzstenciltarget(device_t device);
+EXPORT void device_setrendertarget(device_t device, texture_t tex,
+		zstencil_t zstencil);
+EXPORT void device_setcuberendertarget(device_t device, texture_t cubetex,
+		int side, zstencil_t zstencil);
+EXPORT void device_copy_texture(device_t device, texture_t dst, texture_t src);
+EXPORT void device_stage_texture(device_t device, stagesurf_t dst,
+		texture_t src);
+EXPORT void device_beginscene(device_t device);
+EXPORT void device_draw(device_t device, enum gs_draw_mode draw_mode,
+		uint32_t start_vert, uint32_t num_verts);
+EXPORT void device_endscene(device_t device);
+EXPORT void device_load_swapchain(device_t device, swapchain_t swapchain);
+EXPORT void device_clear(device_t device, uint32_t clear_flags,
+		struct vec4 *color, float depth, uint8_t stencil);
+EXPORT void device_present(device_t device);
+EXPORT void device_setcullmode(device_t device, enum gs_cull_mode mode);
+EXPORT enum gs_cull_mode device_getcullmode(device_t device);
+EXPORT void device_enable_blending(device_t device, bool enable);
+EXPORT void device_enable_depthtest(device_t device, bool enable);
+EXPORT void device_enable_stenciltest(device_t device, bool enable);
+EXPORT void device_enable_stencilwrite(device_t device, bool enable);
+EXPORT void device_enable_color(device_t device, bool red, bool blue,
+		bool green, bool alpha);
+EXPORT void device_blendfunction(device_t device, enum gs_blend_type src,
+		enum gs_blend_type dest);
+EXPORT void device_depthfunction(device_t device, enum gs_depth_test test);
+EXPORT void device_stencilfunction(device_t device, enum gs_stencil_side side,
+		enum gs_depth_test test);
+EXPORT void device_stencilop(device_t device, enum gs_stencil_side side,
+		enum gs_stencil_op fail, enum gs_stencil_op zfail,
+		enum gs_stencil_op zpass);
+EXPORT void device_enable_fullscreen(device_t device, bool enable);
+EXPORT int device_fullscreen_enabled(device_t device);
+EXPORT void device_setdisplaymode(device_t device,
+		const struct gs_display_mode *mode);
+EXPORT void device_getdisplaymode(device_t device,
+		struct gs_display_mode *mode);
+EXPORT void device_setcolorramp(device_t device, float gamma, float brightness,
+		float contrast);
+EXPORT void device_setviewport(device_t device, int x, int y, int width,
+		int height);
+EXPORT void device_getviewport(device_t device, struct gs_rect *rect);
+EXPORT void device_setscissorrect(device_t device, struct gs_rect *rect);
+EXPORT void device_ortho(device_t device, float left, float right,
+		float top, float bottom, float znear, float zfar);
+EXPORT void device_frustum(device_t device, float left, float right,
+		float top, float bottom, float znear, float zfar);
+EXPORT void device_perspective(device_t device, float fovy, float aspect,
+		float znear, float zfar);
+EXPORT void device_set_view_matrix(device_t device, struct matrix3 *mat);
+EXPORT void device_projection_push(device_t device);
+EXPORT void device_projection_pop(device_t device);
+
+EXPORT void     swapchain_destroy(swapchain_t swapchain);
+
+EXPORT void     texture_destroy(texture_t tex);
+EXPORT uint32_t texture_getwidth(texture_t tex);
+EXPORT uint32_t texture_getheight(texture_t tex);
+EXPORT enum gs_color_format texture_getcolorformat(texture_t tex);
+EXPORT bool     texture_map(texture_t tex, void **ptr, uint32_t *byte_width);
+EXPORT void     texture_unmap(texture_t tex);
+
+EXPORT void     cubetexture_destroy(texture_t cubetex);
+EXPORT uint32_t cubetexture_getsize(texture_t cubetex);
+EXPORT enum gs_color_format cubetexture_getcolorformat(texture_t cubetex);
+
+EXPORT void     volumetexture_destroy(texture_t voltex);
+EXPORT uint32_t volumetexture_getwidth(texture_t voltex);
+EXPORT uint32_t volumetexture_getheight(texture_t voltex);
+EXPORT uint32_t volumetexture_getdepth(texture_t voltex);
+EXPORT enum gs_color_format volumetexture_getcolorformat(texture_t voltex);
+
+EXPORT void     stagesurface_destroy(stagesurf_t stagesurf);
+EXPORT uint32_t stagesurface_getwidth(stagesurf_t stagesurf);
+EXPORT uint32_t stagesurface_getheight(stagesurf_t stagesurf);
+EXPORT enum gs_color_format stagesurface_getcolorformat(stagesurf_t stagesurf);
+EXPORT bool     stagesurface_map(stagesurf_t stagesurf, const void **data,
+		uint32_t *byte_width);
+EXPORT void     stagesurface_unmap(stagesurf_t stagesurf);
+
+EXPORT void zstencil_destroy(zstencil_t zstencil);
+
+EXPORT void samplerstate_destroy(samplerstate_t samplerstate);
+
+EXPORT void vertexbuffer_destroy(vertbuffer_t vertbuffer);
+EXPORT void vertexbuffer_flush(vertbuffer_t vertbuffer, bool rebuild);
+EXPORT struct vb_data *vertexbuffer_getdata(vertbuffer_t vertbuffer);
+
+EXPORT void   indexbuffer_destroy(indexbuffer_t indexbuffer);
+EXPORT void   indexbuffer_flush(indexbuffer_t indexbuffer);
+EXPORT void  *indexbuffer_getdata(indexbuffer_t indexbuffer);
+EXPORT size_t indexbuffer_numindices(indexbuffer_t indexbuffer);
+EXPORT enum gs_index_type indexbuffer_gettype(indexbuffer_t indexbuffer);
+
+EXPORT void shader_destroy(shader_t shader);
+EXPORT int shader_numparams(shader_t shader);
+EXPORT sparam_t shader_getparambyidx(shader_t shader, int param);
+EXPORT sparam_t shader_getparambyname(shader_t shader, const char *name);
+EXPORT void shader_getparaminfo(shader_t shader, sparam_t param,
+		struct shader_param_info *info);
+EXPORT sparam_t shader_getviewprojmatrix(shader_t shader);
+EXPORT sparam_t shader_getworldmatrix(shader_t shader);
+EXPORT void shader_setbool(shader_t shader, sparam_t param, bool val);
+EXPORT void shader_setfloat(shader_t shader, sparam_t param, float val);
+EXPORT void shader_setint(shader_t shader, sparam_t param, int val);
+EXPORT void shader_setmatrix3(shader_t shader, sparam_t param,
+		const struct matrix3 *val);
+EXPORT void shader_setmatrix4(shader_t shader, sparam_t param,
+		const struct matrix4 *val);
+EXPORT void shader_setvec2(shader_t shader, sparam_t param,
+		const struct vec2 *val);
+EXPORT void shader_setvec3(shader_t shader, sparam_t param,
+		const struct vec3 *val);
+EXPORT void shader_setvec4(shader_t shader, sparam_t param,
+		const struct vec4 *val);
+EXPORT void shader_settexture(shader_t shader, sparam_t param, texture_t val);
+EXPORT void shader_setval(shader_t shader, sparam_t param, const void *val,
+		size_t size);
+EXPORT void shader_setdefault(shader_t shader, sparam_t param);
+
+#endif

libobs-opengl/gl-subsystem.h

@@ -18,6 +18,13 @@
 #ifndef GL_SUBSYSTEM_H
 #define GL_SUBSYSTEM_H
 
-#include "glew.h"
+#include "graphics/graphics.h"
+#include "glew/include/GL/glew.h"
+
+struct gl_platform;
+
+struct gs_device {
+	struct gl_platform *plat;
+};
 
 #endif

libobs-opengl/gl-windows.c

+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#include "util/darray.h"
+#include "gl-subsystem.h"
+#include "glew/include/GL/wglew.h"
+
+struct gl_platform {
+	HDC   hdc;
+	HGLRC hrc;
+};
+
+struct gl_window {
+	HDC hdc;
+};
+
+/* would use designated initializers but microsoft sort of sucks */
+static inline void init_dummy_pixel_format(PIXELFORMATDESCRIPTOR *pfd)
+{
+	memset(&pfd, 0, sizeof(pfd));
+	pfd->nSize        = sizeof(pfd);
+	pfd->nVersion     = 1;
+	pfd->iPixelType   = PFD_TYPE_RGBA;
+	pfd->cColorBits   = 32;
+	pfd->cDepthBits   = 24;
+	pfd->cStencilBits = 8;
+	pfd->iLayerType   = PFD_MAIN_PLANE;
+	pfd->dwFlags      = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL |
+                            PFD_DOUBLEBUFFER;
+}
+
+static bool gl_create_false_context(struct gl_platform *plat,
+		struct gs_init_data *info)
+{
+	PIXELFORMATDESCRIPTOR pfd;
+	int format_index;
+
+	plat->hdc = GetDC(info->hwnd);
+
+	init_dummy_pixel_format(&pfd);
+
+	format_index = ChoosePixelFormat(plat->hdc, &pfd);
+	if (!format_index) {
+		blog(LOG_ERROR, "ChoosePixelFormat failed, %u", GetLastError());
+		return false;
+	}
+
+	if (!SetPixelFormat(plat->hdc, format_index, &pfd)) {
+		blog(LOG_ERROR, "SetPixelFormat failed, %u", GetLastError());
+		return false;
+	}
+
+	plat->hrc = wglCreateContext(plat->hdc);
+	if (!plat->hrc) {
+		blog(LOG_ERROR, "wglCreateContext failed, %u", GetLastError());
+		return false;
+	}
+
+	if (!wglMakeCurrent(plat->hdc, plat->hrc)) {
+		blog(LOG_ERROR, "wglMakeCurrent failed, %u", GetLastError());
+		return false;
+	}
+
+	return true;
+}
+
+static inline void required_extension_error(const char *extension)
+{
+	blog(LOG_ERROR, "OpenGL extension %s is required", extension);
+}
+
+static bool gl_init_extensions(void)
+{
+	GLenum errorcode = glewInit();
+	if (errorcode != GLEW_OK) {
+		blog(LOG_ERROR, "glewInit failed, %u", errorcode);
+		return false;
+	}
+
+	if (!GLEW_VERSION_2_1) {
+		blog(LOG_ERROR, "OpenGL 2.1 minimum required by the graphics "
+		                "adapter");
+		return false;
+	}
+
+	if (!GLEW_ARB_framebuffer_object) {
+		required_extension_error("GL_ARB_framebuffer_object");
+		return false;
+	}
+
+	if (!WGLEW_EXT_swap_control) {
+		required_extension_error("WGL_EXT_swap_control");
+		return false;
+	}
+
+	if (!WGLEW_ARB_pixel_format) {
+		required_extension_error("WGL_ARB_pixel_format");
+		return false;
+	}
+
+	return true;
+}
+
+static inline int get_color_format_bits(enum gs_color_format format)
+{
+	switch (format) {
+	case GS_RGBA:
+		return 32;
+	default:
+		return 0;
+	}
+}
+
+static inline int get_depth_format_bits(enum gs_zstencil_format zsformat)
+{
+	switch (zsformat) {
+	case GS_Z16:
+		return 16;
+	case GS_Z24_S8:
+		return 24;
+	default:
+		return 0;
+	}
+}
+
+static inline int get_stencil_format_bits(enum gs_zstencil_format zsformat)
+{
+	switch (zsformat) {
+	case GS_Z24_S8:
+		return 8;
+	default:
+		return 0;
+	}
+}
+
+static inline void add_attrib(struct darray *list, int attrib, int val)
+{
+	darray_push_back(sizeof(int), list, &attrib);
+	darray_push_back(sizeof(int), list, &val);
+}
+
+static int gl_get_pixel_format(struct gl_platform *plat,
+		struct gs_init_data *info)
+{
+	struct darray attribs;
+	int color_bits   = get_color_format_bits(info->format);
+	int depth_bits   = get_depth_format_bits(info->zsformat);
+	int stencil_bits = get_stencil_format_bits(info->zsformat);
+	UINT num_formats;
+	int format;
+
+	if (!color_bits) {
+		blog(LOG_ERROR, "gl_init_pixel_format: color format not "
+		                "supported");
+		return false;
+	}
+
+	darray_init(&attribs);
+	add_attrib(&attribs, WGL_DRAW_TO_WINDOW_ARB, GL_TRUE);
+	add_attrib(&attribs, WGL_SUPPORT_OPENGL_ARB, GL_TRUE);
+	add_attrib(&attribs, WGL_ACCELERATION_ARB,   WGL_FULL_ACCELERATION_ARB);
+	add_attrib(&attribs, WGL_DOUBLE_BUFFER_ARB,  GL_TRUE);
+	add_attrib(&attribs, WGL_PIXEL_TYPE_ARB,     WGL_TYPE_RGBA_ARB);
+	add_attrib(&attribs, WGL_COLOR_BITS_ARB,     color_bits);
+	add_attrib(&attribs, WGL_DEPTH_BITS_ARB,     depth_bits);
+	add_attrib(&attribs, WGL_STENCIL_BITS_ARB,   stencil_bits);
+	add_attrib(&attribs, 0, 0);
+
+	if (!wglChoosePixelFormatARB(plat->hdc, attribs.array, NULL, 1,
+			&format, &num_formats)) {
+		blog(LOG_ERROR, "wglChoosePixelFormatARB failed, %u",
+				GetLastError());
+		format = 0;
+	}
+
+	darray_free(&attribs);
+
+	return format;
+}
+
+static inline bool gl_init_pixel_format(struct gl_platform *plat,
+		struct gs_init_data *info)
+{
+	PIXELFORMATDESCRIPTOR pfd;
+	int format = gl_get_pixel_format(plat, info);
+
+	if (!format)
+		return false;
+
+	if (!DescribePixelFormat(plat->hdc, format, sizeof(pfd), &pfd)) {
+		blog(LOG_ERROR, "DescribePixelFormat failed, %u",
+				GetLastError());
+		return false;
+	}
+
+	if (!SetPixelFormat(plat->hdc, format, &pfd)) {
+		blog(LOG_ERROR, "SetPixelFormat failed, %u", GetLastError());
+		return false;
+	}
+
+	return true;
+}
+
+bool gl_platform_init(struct gs_device *device, struct gs_init_data *info)
+{
+	device->plat = bmalloc(sizeof(struct gl_platform));
+	memset(device->plat, 0, sizeof(struct gl_platform));
+
+	if (!gl_create_false_context(device->plat, info))
+		goto fail;
+
+	if (!gl_init_extensions())
+		goto fail;
+
+	if (!gl_init_pixel_format(device->plat, info))
+		goto fail;
+
+	return true;
+
+fail:
+	return false;
+}