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gl-subsystem.c
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/******************************************************************************
Copyright (C) 2013 by Hugh Bailey <[email protected]>
Copyright (C) 2014 by Zachary Lund <[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 2 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/>.
******************************************************************************/
#include <graphics/matrix3.h>
#include "gl-subsystem.h"
/* Goofy Windows.h macros need to be removed */
#undef far
#undef near
/* #define SHOW_ALL_GL_MESSAGES */
#ifdef _DEBUG
static void APIENTRY gl_debug_proc(
GLenum source, GLenum type, GLuint id, GLenum severity,
GLsizei length, const GLchar *message, const GLvoid *data )
{
UNUSED_PARAMETER(id);
UNUSED_PARAMETER(data);
char *source_str, *type_str, *severity_str;
/* frames can get a bit too much spam with irrelevant/insignificant opengl
* debug messages */
#ifndef SHOW_ALL_GL_MESSAGES
if (type > GL_DEBUG_TYPE_PORTABILITY &&
severity != GL_DEBUG_SEVERITY_HIGH) {
return;
}
#endif
switch(source) {
case GL_DEBUG_SOURCE_API:
source_str = "API"; break;
case GL_DEBUG_SOURCE_WINDOW_SYSTEM:
source_str = "Window System"; break;
case GL_DEBUG_SOURCE_SHADER_COMPILER:
source_str = "Shader Compiler"; break;
case GL_DEBUG_SOURCE_THIRD_PARTY:
source_str = "Third Party"; break;
case GL_DEBUG_SOURCE_APPLICATION:
source_str = "Application"; break;
case GL_DEBUG_SOURCE_OTHER:
source_str = "Other"; break;
default:
source_str = "Unknown";
}
switch(type) {
case GL_DEBUG_TYPE_ERROR:
type_str = "Error"; break;
case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR:
type_str = "Deprecated Behavior"; break;
case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:
type_str = "Undefined Behavior"; break;
case GL_DEBUG_TYPE_PORTABILITY:
type_str = "Portability"; break;
case GL_DEBUG_TYPE_PERFORMANCE:
type_str = "Performance"; break;
case GL_DEBUG_TYPE_OTHER:
type_str = "Other"; break;
default:
type_str = "Unknown";
}
switch(severity) {
case GL_DEBUG_SEVERITY_HIGH:
severity_str = "High"; break;
case GL_DEBUG_SEVERITY_MEDIUM:
severity_str = "Medium"; break;
case GL_DEBUG_SEVERITY_LOW:
severity_str = "Low"; break;
case GL_DEBUG_SEVERITY_NOTIFICATION:
severity_str = "Notification"; break;
default:
severity_str = "Unknown";
}
blog(LOG_DEBUG,
"[%s][%s]{%s}: %.*s",
source_str, type_str, severity_str,
length, message
);
}
static void gl_enable_debug()
{
if (GLAD_GL_VERSION_4_3) {
glDebugMessageCallback(gl_debug_proc, NULL);
gl_enable(GL_DEBUG_OUTPUT);
} else if (GLAD_GL_ARB_debug_output) {
glDebugMessageCallbackARB(gl_debug_proc, NULL);
} else {
blog(LOG_DEBUG, "Failed to set GL debug callback as it is "
"not supported.");
}
}
#else
static void gl_enable_debug() {}
#endif
static bool gl_init_extensions(struct gs_device* device)
{
if (!GLAD_GL_VERSION_2_1) {
blog(LOG_ERROR, "obs-studio requires OpenGL version 2.1 or "
"higher.");
return false;
}
gl_enable_debug();
if (!GLAD_GL_VERSION_3_0 && !GLAD_GL_ARB_framebuffer_object) {
blog(LOG_ERROR, "OpenGL extension ARB_framebuffer_object "
"is required.");
return false;
}
if (GLAD_GL_VERSION_3_2 || GLAD_GL_ARB_seamless_cube_map) {
gl_enable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
}
if (GLAD_GL_VERSION_4_3 || GLAD_GL_ARB_copy_image)
device->copy_type = COPY_TYPE_ARB;
else if (GLAD_GL_NV_copy_image)
device->copy_type = COPY_TYPE_NV;
else
device->copy_type = COPY_TYPE_FBO_BLIT;
return true;
}
static void clear_textures(struct gs_device *device)
{
GLenum i;
for (i = 0; i < GS_MAX_TEXTURES; i++) {
if (device->cur_textures[i]) {
gl_active_texture(GL_TEXTURE0 + i);
gl_bind_texture(device->cur_textures[i]->gl_target, 0);
device->cur_textures[i] = NULL;
}
}
}
void convert_sampler_info(struct gs_sampler_state *sampler,
const struct gs_sampler_info *info)
{
GLint max_anisotropy_max;
convert_filter(info->filter, &sampler->min_filter,
&sampler->mag_filter);
sampler->address_u = convert_address_mode(info->address_u);
sampler->address_v = convert_address_mode(info->address_v);
sampler->address_w = convert_address_mode(info->address_w);
sampler->max_anisotropy = info->max_anisotropy;
max_anisotropy_max = 1;
glGetIntegerv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &max_anisotropy_max);
gl_success("glGetIntegerv(GL_MAX_TEXTURE_ANISOTROPY_MAX)");
if (1 <= sampler->max_anisotropy &&
sampler->max_anisotropy <= max_anisotropy_max)
return;
if (sampler->max_anisotropy < 1)
sampler->max_anisotropy = 1;
else if (sampler->max_anisotropy > max_anisotropy_max)
sampler->max_anisotropy = max_anisotropy_max;
blog(LOG_DEBUG, "convert_sampler_info: 1 <= max_anisotropy <= "
"%d violated, selected: %d, set: %d",
max_anisotropy_max,
info->max_anisotropy, sampler->max_anisotropy);
}
const char *device_get_name(void)
{
return "OpenGL";
}
int device_get_type(void)
{
return GS_DEVICE_OPENGL;
}
const char *device_preprocessor_name(void)
{
return "_OPENGL";
}
int device_create(gs_device_t **p_device, const struct gs_init_data *info)
{
struct gs_device *device = bzalloc(sizeof(struct gs_device));
int errorcode = GS_ERROR_FAIL;
device->plat = gl_platform_create(device, info);
if (!device->plat)
goto fail;
if (!gl_init_extensions(device)) {
errorcode = GS_ERROR_NOT_SUPPORTED;
goto fail;
}
gl_enable(GL_CULL_FACE);
device_leave_context(device);
device->cur_swap = gl_platform_getswap(device->plat);
*p_device = device;
return GS_SUCCESS;
fail:
blog(LOG_ERROR, "device_create (GL) failed");
bfree(device);
*p_device = NULL;
return errorcode;
}
void device_destroy(gs_device_t *device)
{
if (device) {
size_t i;
for (i = 0; i < device->fbos.num; i++)
fbo_info_destroy(device->fbos.array[i]);
while (device->first_program)
gs_program_destroy(device->first_program);
da_free(device->proj_stack);
da_free(device->fbos);
gl_platform_destroy(device->plat);
bfree(device);
}
}
gs_swapchain_t *device_swapchain_create(gs_device_t *device,
const struct gs_init_data *info)
{
struct gs_swap_chain *swap = bzalloc(sizeof(struct gs_swap_chain));
swap->device = device;
swap->info = *info;
swap->wi = gl_windowinfo_create(info);
if (!swap->wi) {
blog(LOG_ERROR, "device_swapchain_create (GL) failed");
gs_swapchain_destroy(swap);
return NULL;
}
if (!gl_platform_init_swapchain(swap)) {
blog(LOG_ERROR, "gl_platform_init_swapchain failed");
gs_swapchain_destroy(swap);
return NULL;
}
return swap;
}
void device_resize(gs_device_t *device, uint32_t cx, uint32_t cy)
{
/* GL automatically resizes the device, so it doesn't do much */
device->cur_swap->info.cx = cx;
device->cur_swap->info.cy = cy;
gl_update(device);
}
void device_get_size(const gs_device_t *device, uint32_t *cx, uint32_t *cy)
{
*cx = device->cur_swap->info.cx;
*cy = device->cur_swap->info.cy;
}
uint32_t device_get_width(const gs_device_t *device)
{
return device->cur_swap->info.cx;
}
uint32_t device_get_height(const gs_device_t *device)
{
return device->cur_swap->info.cy;
}
gs_texture_t *device_voltexture_create(gs_device_t *device, uint32_t width,
uint32_t height, uint32_t depth,
enum gs_color_format color_format, uint32_t levels,
const uint8_t **data, uint32_t flags)
{
/* TODO */
UNUSED_PARAMETER(device);
UNUSED_PARAMETER(width);
UNUSED_PARAMETER(height);
UNUSED_PARAMETER(depth);
UNUSED_PARAMETER(color_format);
UNUSED_PARAMETER(levels);
UNUSED_PARAMETER(data);
UNUSED_PARAMETER(flags);
return NULL;
}
gs_samplerstate_t *device_samplerstate_create(gs_device_t *device,
const struct gs_sampler_info *info)
{
struct gs_sampler_state *sampler;
sampler = bzalloc(sizeof(struct gs_sampler_state));
sampler->device = device;
sampler->ref = 1;
convert_sampler_info(sampler, info);
return sampler;
}
enum gs_texture_type device_get_texture_type(const gs_texture_t *texture)
{
return texture->type;
}
static void strip_mipmap_filter(GLint *filter)
{
switch (*filter) {
case GL_NEAREST:
case GL_LINEAR:
return;
case GL_NEAREST_MIPMAP_NEAREST:
case GL_NEAREST_MIPMAP_LINEAR:
*filter = GL_NEAREST;
return;
case GL_LINEAR_MIPMAP_NEAREST:
case GL_LINEAR_MIPMAP_LINEAR:
*filter = GL_LINEAR;
return;
}
*filter = GL_NEAREST;
}
static inline void apply_swizzle(struct gs_texture *tex)
{
if (tex->format == GS_A8) {
gl_tex_param_i(tex->gl_target, GL_TEXTURE_SWIZZLE_R, GL_ONE);
gl_tex_param_i(tex->gl_target, GL_TEXTURE_SWIZZLE_G, GL_ONE);
gl_tex_param_i(tex->gl_target, GL_TEXTURE_SWIZZLE_B, GL_ONE);
gl_tex_param_i(tex->gl_target, GL_TEXTURE_SWIZZLE_A, GL_RED);
}
}
static bool load_texture_sampler(gs_texture_t *tex, gs_samplerstate_t *ss)
{
bool success = true;
GLint min_filter;
if (tex->cur_sampler == ss)
return true;
if (tex->cur_sampler)
samplerstate_release(tex->cur_sampler);
tex->cur_sampler = ss;
if (!ss)
return true;
samplerstate_addref(ss);
min_filter = ss->min_filter;
if (gs_texture_is_rect(tex))
strip_mipmap_filter(&min_filter);
if (!gl_tex_param_i(tex->gl_target, GL_TEXTURE_MIN_FILTER,
min_filter))
success = false;
if (!gl_tex_param_i(tex->gl_target, GL_TEXTURE_MAG_FILTER,
ss->mag_filter))
success = false;
if (!gl_tex_param_i(tex->gl_target, GL_TEXTURE_WRAP_S, ss->address_u))
success = false;
if (!gl_tex_param_i(tex->gl_target, GL_TEXTURE_WRAP_T, ss->address_v))
success = false;
if (!gl_tex_param_i(tex->gl_target, GL_TEXTURE_WRAP_R, ss->address_w))
success = false;
if (!gl_tex_param_i(tex->gl_target, GL_TEXTURE_MAX_ANISOTROPY_EXT,
ss->max_anisotropy))
success = false;
apply_swizzle(tex);
return success;
}
static inline struct gs_shader_param *get_texture_param(gs_device_t *device,
int unit)
{
struct gs_shader *shader = device->cur_pixel_shader;
size_t i;
for (i = 0; i < shader->params.num; i++) {
struct gs_shader_param *param = shader->params.array+i;
if (param->type == GS_SHADER_PARAM_TEXTURE) {
if (param->texture_id == unit)
return param;
}
}
return NULL;
}
void device_load_texture(gs_device_t *device, gs_texture_t *tex, int unit)
{
struct gs_shader_param *param;
struct gs_sampler_state *sampler;
struct gs_texture *cur_tex = device->cur_textures[unit];
/* need a pixel shader to properly bind textures */
if (!device->cur_pixel_shader)
tex = NULL;
if (cur_tex == tex)
return;
if (!gl_active_texture(GL_TEXTURE0 + unit))
goto fail;
/* the target for the previous text may not be the same as the
* next texture, so unbind the previous texture first to be safe */
if (cur_tex && (!tex || cur_tex->gl_target != tex->gl_target))
gl_bind_texture(cur_tex->gl_target, 0);
device->cur_textures[unit] = tex;
param = get_texture_param(device, unit);
if (!param)
return;
param->texture = tex;
if (!tex)
return;
sampler = device->cur_samplers[param->sampler_id];
if (!gl_bind_texture(tex->gl_target, tex->texture))
goto fail;
if (sampler && !load_texture_sampler(tex, sampler))
goto fail;
return;
fail:
blog(LOG_ERROR, "device_load_texture (GL) failed");
}
static bool load_sampler_on_textures(gs_device_t *device, gs_samplerstate_t *ss,
int sampler_unit)
{
struct gs_shader *shader = device->cur_pixel_shader;
size_t i;
for (i = 0; i < shader->params.num; i++) {
struct gs_shader_param *param = shader->params.array+i;
if (param->type == GS_SHADER_PARAM_TEXTURE &&
param->sampler_id == (uint32_t)sampler_unit &&
param->texture) {
if (!gl_active_texture(GL_TEXTURE0 + param->texture_id))
return false;
if (!load_texture_sampler(param->texture, ss))
return false;
}
}
return true;
}
void device_load_samplerstate(gs_device_t *device, gs_samplerstate_t *ss,
int unit)
{
/* need a pixel shader to properly bind samplers */
if (!device->cur_pixel_shader)
ss = NULL;
if (device->cur_samplers[unit] == ss)
return;
device->cur_samplers[unit] = ss;
if (!ss)
return;
if (!load_sampler_on_textures(device, ss, unit))
blog(LOG_ERROR, "device_load_samplerstate (GL) failed");
return;
}
void device_load_vertexshader(gs_device_t *device, gs_shader_t *vertshader)
{
if (device->cur_vertex_shader == vertshader)
return;
if (vertshader && vertshader->type != GS_SHADER_VERTEX) {
blog(LOG_ERROR, "Specified shader is not a vertex shader");
blog(LOG_ERROR, "device_load_vertexshader (GL) failed");
return;
}
device->cur_vertex_shader = vertshader;
}
static void load_default_pixelshader_samplers(struct gs_device *device,
struct gs_shader *ps)
{
size_t i;
if (!ps)
return;
for (i = 0; i < ps->samplers.num; i++) {
struct gs_sampler_state *ss = ps->samplers.array[i];
device->cur_samplers[i] = ss;
}
for (; i < GS_MAX_TEXTURES; i++)
device->cur_samplers[i] = NULL;
}
void device_load_pixelshader(gs_device_t *device, gs_shader_t *pixelshader)
{
if (device->cur_pixel_shader == pixelshader)
return;
if (pixelshader && pixelshader->type != GS_SHADER_PIXEL) {
blog(LOG_ERROR, "Specified shader is not a pixel shader");
goto fail;
}
device->cur_pixel_shader = pixelshader;
clear_textures(device);
if (pixelshader)
load_default_pixelshader_samplers(device, pixelshader);
return;
fail:
blog(LOG_ERROR, "device_load_pixelshader (GL) failed");
}
void device_load_default_samplerstate(gs_device_t *device, bool b_3d, int unit)
{
/* TODO */
UNUSED_PARAMETER(device);
UNUSED_PARAMETER(b_3d);
UNUSED_PARAMETER(unit);
}
gs_shader_t *device_get_vertex_shader(const gs_device_t *device)
{
return device->cur_vertex_shader;
}
gs_shader_t *device_get_pixel_shader(const gs_device_t *device)
{
return device->cur_pixel_shader;
}
gs_texture_t *device_get_render_target(const gs_device_t *device)
{
return device->cur_render_target;
}
gs_zstencil_t *device_get_zstencil_target(const gs_device_t *device)
{
return device->cur_zstencil_buffer;
}
static bool get_tex_dimensions(gs_texture_t *tex, uint32_t *width,
uint32_t *height)
{
if (tex->type == GS_TEXTURE_2D) {
struct gs_texture_2d *tex2d = (struct gs_texture_2d*)tex;
*width = tex2d->width;
*height = tex2d->height;
return true;
} else if (tex->type == GS_TEXTURE_CUBE) {
struct gs_texture_cube *cube = (struct gs_texture_cube*)tex;
*width = cube->size;
*height = cube->size;
return true;
}
blog(LOG_ERROR, "Texture must be 2D or cubemap");
return false;
}
/*
* This automatically manages FBOs so that render targets are always given
* an FBO that matches their width/height/format to maximize optimization
*/
struct fbo_info *get_fbo(struct gs_device *device,
uint32_t width, uint32_t height, enum gs_color_format format)
{
size_t i;
GLuint fbo;
struct fbo_info *ptr;
for (i = 0; i < device->fbos.num; i++) {
ptr = device->fbos.array[i];
if (ptr->width == width && ptr->height == height &&
ptr->format == format)
return ptr;
}
glGenFramebuffers(1, &fbo);
if (!gl_success("glGenFramebuffers"))
return NULL;
ptr = bmalloc(sizeof(struct fbo_info));
ptr->fbo = fbo;
ptr->width = width;
ptr->height = height;
ptr->format = format;
ptr->cur_render_target = NULL;
ptr->cur_render_side = 0;
ptr->cur_zstencil_buffer = NULL;
da_push_back(device->fbos, &ptr);
return ptr;
}
static inline struct fbo_info *get_fbo_by_tex(struct gs_device *device,
gs_texture_t *tex)
{
uint32_t width, height;
if (!get_tex_dimensions(tex, &width, &height))
return NULL;
return get_fbo(device, width, height, tex->format);
}
static bool set_current_fbo(gs_device_t *device, struct fbo_info *fbo)
{
if (device->cur_fbo != fbo) {
GLuint fbo_obj = fbo ? fbo->fbo : 0;
if (!gl_bind_framebuffer(GL_DRAW_FRAMEBUFFER, fbo_obj))
return false;
if (device->cur_fbo) {
device->cur_fbo->cur_render_target = NULL;
device->cur_fbo->cur_zstencil_buffer = NULL;
}
}
device->cur_fbo = fbo;
return true;
}
static bool attach_rendertarget(struct fbo_info *fbo, gs_texture_t *tex,
int side)
{
if (fbo->cur_render_target == tex)
return true;
fbo->cur_render_target = tex;
if (tex->type == GS_TEXTURE_2D) {
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
tex->texture, 0);
} else if (tex->type == GS_TEXTURE_CUBE) {
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0,
GL_TEXTURE_CUBE_MAP_POSITIVE_X + side,
tex->texture, 0);
} else {
return false;
}
return gl_success("glFramebufferTexture2D");
}
static bool attach_zstencil(struct fbo_info *fbo, gs_zstencil_t *zs)
{
GLuint zsbuffer = 0;
GLenum zs_attachment = GL_DEPTH_STENCIL_ATTACHMENT;
if (fbo->cur_zstencil_buffer == zs)
return true;
fbo->cur_zstencil_buffer = zs;
if (zs) {
zsbuffer = zs->buffer;
zs_attachment = zs->attachment;
}
glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,
zs_attachment, GL_RENDERBUFFER, zsbuffer);
if (!gl_success("glFramebufferRenderbuffer"))
return false;
return true;
}
static bool set_target(gs_device_t *device, gs_texture_t *tex, int side,
gs_zstencil_t *zs)
{
struct fbo_info *fbo;
if (device->cur_render_target == tex &&
device->cur_zstencil_buffer == zs &&
device->cur_render_side == side)
return true;
device->cur_render_target = tex;
device->cur_render_side = side;
device->cur_zstencil_buffer = zs;
if (!tex)
return set_current_fbo(device, NULL);
fbo = get_fbo_by_tex(device, tex);
if (!fbo)
return false;
set_current_fbo(device, fbo);
if (!attach_rendertarget(fbo, tex, side))
return false;
if (!attach_zstencil(fbo, zs))
return false;
return true;
}
void device_set_render_target(gs_device_t *device, gs_texture_t *tex,
gs_zstencil_t *zstencil)
{
if (tex) {
if (tex->type != GS_TEXTURE_2D) {
blog(LOG_ERROR, "Texture is not a 2D texture");
goto fail;
}
if (!tex->is_render_target) {
blog(LOG_ERROR, "Texture is not a render target");
goto fail;
}
}
if (!set_target(device, tex, 0, zstencil))
goto fail;
return;
fail:
blog(LOG_ERROR, "device_set_render_target (GL) failed");
}
void device_set_cube_render_target(gs_device_t *device, gs_texture_t *cubetex,
int side, gs_zstencil_t *zstencil)
{
if (cubetex) {
if (cubetex->type != GS_TEXTURE_CUBE) {
blog(LOG_ERROR, "Texture is not a cube texture");
goto fail;
}
if (!cubetex->is_render_target) {
blog(LOG_ERROR, "Texture is not a render target");
goto fail;
}
}
if (!set_target(device, cubetex, side, zstencil))
goto fail;
return;
fail:
blog(LOG_ERROR, "device_set_cube_render_target (GL) failed");
}
void device_copy_texture_region(gs_device_t *device,
gs_texture_t *dst, uint32_t dst_x, uint32_t dst_y,
gs_texture_t *src, uint32_t src_x, uint32_t src_y,
uint32_t src_w, uint32_t src_h)
{
struct gs_texture_2d *src2d = (struct gs_texture_2d*)src;
struct gs_texture_2d *dst2d = (struct gs_texture_2d*)dst;
if (!src) {
blog(LOG_ERROR, "Source texture is NULL");
goto fail;
}
if (!dst) {
blog(LOG_ERROR, "Destination texture is NULL");
goto fail;
}
if (dst->type != GS_TEXTURE_2D || src->type != GS_TEXTURE_2D) {
blog(LOG_ERROR, "Source and destination textures must be 2D "
"textures");
goto fail;
}
if (dst->format != src->format) {
blog(LOG_ERROR, "Source and destination formats do not match");
goto fail;
}
uint32_t nw = (uint32_t)src_w ?
(uint32_t)src_w : (src2d->width - src_x);
uint32_t nh = (uint32_t)src_h ?
(uint32_t)src_h : (src2d->height - src_y);
if (dst2d->width - dst_x < nw || dst2d->height - dst_y < nh) {
blog(LOG_ERROR, "Destination texture region is not big "
"enough to hold the source region");
goto fail;
}
if (!gl_copy_texture(device, dst->texture, dst->gl_target, dst_x, dst_y,
src->texture, src->gl_target, src_x, src_y,
nw, nh, src->format))
goto fail;
return;
fail:
blog(LOG_ERROR, "device_copy_texture (GL) failed");
}
void device_copy_texture(gs_device_t *device, gs_texture_t *dst,
gs_texture_t *src)
{
device_copy_texture_region(device, dst, 0, 0, src, 0, 0, 0, 0);
}
void device_begin_scene(gs_device_t *device)
{
clear_textures(device);
}
static inline bool can_render(const gs_device_t *device)
{
if (!device->cur_vertex_shader) {
blog(LOG_ERROR, "No vertex shader specified");
return false;
}
if (!device->cur_pixel_shader) {
blog(LOG_ERROR, "No pixel shader specified");
return false;
}
if (!device->cur_vertex_buffer) {
blog(LOG_ERROR, "No vertex buffer specified");
return false;
}
return true;
}
static void update_viewproj_matrix(struct gs_device *device)
{
struct gs_shader *vs = device->cur_vertex_shader;
struct matrix4 cur_proj;
gs_matrix_get(&device->cur_view);
matrix4_copy(&cur_proj, &device->cur_proj);
if (device->cur_fbo) {
cur_proj.x.y = -cur_proj.x.y;
cur_proj.y.y = -cur_proj.y.y;
cur_proj.z.y = -cur_proj.z.y;
cur_proj.t.y = -cur_proj.t.y;
glFrontFace(GL_CW);
} else {
glFrontFace(GL_CCW);
}
gl_success("glFrontFace");
matrix4_mul(&device->cur_viewproj, &device->cur_view, &cur_proj);
matrix4_transpose(&device->cur_viewproj, &device->cur_viewproj);
if (vs->viewproj)
gs_shader_set_matrix4(vs->viewproj, &device->cur_viewproj);
}
static inline struct gs_program *find_program(const struct gs_device *device)
{
struct gs_program *program = device->first_program;
while (program) {
if (program->vertex_shader == device->cur_vertex_shader &&
program->pixel_shader == device->cur_pixel_shader)
return program;
program = program->next;
}
return NULL;
}
static inline struct gs_program *get_shader_program(struct gs_device *device)
{
struct gs_program *program = find_program(device);
if (!program)
program = gs_program_create(device);
return program;
}
void device_draw(gs_device_t *device, enum gs_draw_mode draw_mode,
uint32_t start_vert, uint32_t num_verts)
{
struct gs_index_buffer *ib = device->cur_index_buffer;
GLenum topology = convert_gs_topology(draw_mode);
gs_effect_t *effect = gs_get_effect();
struct gs_program *program;
if (!can_render(device))
goto fail;
if (effect)
gs_effect_update_params(effect);
program = get_shader_program(device);
if (!program)
goto fail;
load_vb_buffers(program, device->cur_vertex_buffer);
if (program != device->cur_program && device->cur_program) {
glUseProgram(0);
gl_success("glUseProgram (zero)");
}
if (program != device->cur_program) {
device->cur_program = program;
glUseProgram(program->obj);
if (!gl_success("glUseProgram"))
goto fail;
}
update_viewproj_matrix(device);
program_update_params(program);
if (ib) {
if (num_verts == 0)
num_verts = (uint32_t)device->cur_index_buffer->num;
glDrawElements(topology, num_verts, ib->gl_type,
(const GLvoid*)(start_vert * ib->width));
if (!gl_success("glDrawElements"))
goto fail;
} else {
if (num_verts == 0)
num_verts = (uint32_t)device->cur_vertex_buffer->num;
glDrawArrays(topology, start_vert, num_verts);
if (!gl_success("glDrawArrays"))
goto fail;
}
return;
fail:
blog(LOG_ERROR, "device_draw (GL) failed");
}
void device_end_scene(gs_device_t *device)
{
/* does nothing */
UNUSED_PARAMETER(device);
}
void device_clear(gs_device_t *device, uint32_t clear_flags,