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win_opengl: Split shader loading to it's own file.

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ts-korhonen
2021-04-16 19:42:02 +03:00
parent 9dbbf8cf05
commit 7a83b463c2
5 changed files with 250 additions and 193 deletions
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192
src/win/win_opengl.c
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@@ -8,16 +8,12 @@
*
* Rendering module for OpenGL
*
* NOTE: This is very much still a work-in-progress.
* Expect missing functionality, hangs and bugs.
*
* TODO: More shader features
* - scaling
* - multipass
* - previous frames
* (UI) options
* More error handling
* ...
*
* Authors: Teemu Korhonen
*
@@ -37,20 +33,18 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define UNICODE
#include <Windows.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_syswm.h>
#include <glad/glad.h>
#include <stdio.h>
#include <86box/86box.h>
#include <86box/plat.h>
#include <86box/video.h>
#include <86box/win.h>
#include <86box/win_opengl.h>
#include <86box/win_opengl_glslp.h>
static const int INIT_WIDTH = 640;
static const int INIT_HEIGHT = 400;
@@ -146,190 +140,6 @@ typedef struct
int* fullscreen;
} winmessage_data;
/**
* @brief Default vertex shader.
*/
static const GLchar* vertex_shader = "#version 330 core\n\
in vec2 VertexCoord;\n\
in vec2 TexCoord;\n\
out vec2 tex;\n\
void main(){\n\
gl_Position = vec4(VertexCoord, 0.0, 1.0);\n\
tex = TexCoord;\n\
}\n";
/**
* @brief Default fragment shader.
*/
static const GLchar* fragment_shader = "#version 330 core\n\
in vec2 tex;\n\
uniform sampler2D texsampler;\n\
void main() {\n\
gl_FragColor = texture(texsampler, tex);\n\
}\n";
/**
* @brief Reads a whole file into a null terminated string.
* @param Path Path to the file relative to executable path.
* @return Pointer to the string or NULL on error. Remember to free() after use.
*/
static char* read_file_to_string(const char* path)
{
char* full_path = (char*)malloc(sizeof(char) * (strlen(path) + strlen(exe_path) + 1));
plat_append_filename(full_path, exe_path, path);
FILE* file_handle = plat_fopen(full_path, "rb");
free(full_path);
if (file_handle != NULL)
{
/* get file size */
fseek(file_handle, 0, SEEK_END);
long file_size = ftell(file_handle);
fseek(file_handle, 0, SEEK_SET);
/* read to buffer and close */
char* content = (char*)malloc(sizeof(char) * (file_size + 1));
size_t length = fread(content, sizeof(char), file_size, file_handle);
fclose(file_handle);
content[length] = 0;
return content;
}
return NULL;
}
/**
* @brief Compile custom shaders into a program.
* @return Shader program identifier.
*/
static GLuint load_custom_shaders()
{
GLint status = GL_FALSE;
int info_log_length;
/* TODO: get path from config */
char* shader = read_file_to_string("shaders/shader.glsl");
if (shader != NULL)
{
int success = 1;
const char* vertex_sources[2] = { "#define VERTEX\n", shader };
const char* fragment_sources[2] = { "#define FRAGMENT\n", shader };
GLuint vertex_id = glCreateShader(GL_VERTEX_SHADER);
GLuint fragment_id = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vertex_id, 2, vertex_sources, NULL);
glCompileShader(vertex_id);
glGetShaderiv(vertex_id, GL_COMPILE_STATUS, &status);
if (status == GL_FALSE)
{
glGetShaderiv(vertex_id, GL_INFO_LOG_LENGTH, &info_log_length);
GLchar* info_log_text = (GLchar*)malloc(sizeof(GLchar) * info_log_length);
glGetShaderInfoLog(vertex_id, info_log_length, NULL, info_log_text);
/* TODO: error logging */
free(info_log_text);
success = 0;
}
glShaderSource(fragment_id, 2, fragment_sources, NULL);
glCompileShader(fragment_id);
glGetShaderiv(fragment_id, GL_COMPILE_STATUS, &status);
if (status == GL_FALSE)
{
glGetShaderiv(fragment_id, GL_INFO_LOG_LENGTH, &info_log_length);
GLchar* info_log_text = (GLchar*)malloc(sizeof(GLchar) * info_log_length);
glGetShaderInfoLog(fragment_id, info_log_length, NULL, info_log_text);
/* TODO: error logging */
free(info_log_text);
success = 0;
}
free(shader);
GLuint prog_id = 0;
if (success)
{
prog_id = glCreateProgram();
glAttachShader(prog_id, vertex_id);
glAttachShader(prog_id, fragment_id);
glLinkProgram(prog_id);
glGetProgramiv(prog_id, GL_LINK_STATUS, &status);
if (status == GL_FALSE)
{
glGetProgramiv(prog_id, GL_INFO_LOG_LENGTH, &info_log_length);
GLchar* info_log_text = (GLchar*)malloc(sizeof(GLchar) * info_log_length);
glGetProgramInfoLog(prog_id, info_log_length, NULL, info_log_text);
/* TODO: error logging */
free(info_log_text);
}
glDetachShader(prog_id, vertex_id);
glDetachShader(prog_id, fragment_id);
}
glDeleteShader(vertex_id);
glDeleteShader(fragment_id);
return prog_id;
}
return 0;
}
/**
* @brief Compile default shaders into a program.
* @return Shader program identifier.
*/
static GLuint load_default_shaders()
{
GLuint vertex_id = glCreateShader(GL_VERTEX_SHADER);
GLuint fragment_id = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vertex_id, 1, &vertex_shader, NULL);
glCompileShader(vertex_id);
glShaderSource(fragment_id, 1, &fragment_shader, NULL);
glCompileShader(fragment_id);
GLuint prog_id = glCreateProgram();
glAttachShader(prog_id, vertex_id);
glAttachShader(prog_id, fragment_id);
glLinkProgram(prog_id);
glDetachShader(prog_id, vertex_id);
glDetachShader(prog_id, fragment_id);
glDeleteShader(vertex_id);
glDeleteShader(fragment_id);
return prog_id;
}
/**
* @brief Set or unset OpenGL context window as a child window.
*