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// supports OpenGL 2.0 / OpenGL ES 2.0
// when using OpenGL ES, define MYON_OPENGL_ES
#include "myon_opengl.h"
#include "fmdsp_gl.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef MYON_OPENGL_ES
static const char sh_version[] = "#version 100\n";
#else
static const char sh_version[] = "#version 110\n";
#endif
static const char v_sh[] =
"attribute vec2 coord2d;\n"
"varying vec2 texcoord;\n"
"uniform float xscale;\n"
"uniform float yscale;\n"
"void main(void) {\n"
" vec2 coord = coord2d * vec2(xscale, yscale);\n"
" gl_Position = vec4(coord, 0.0, 1.0);\n"
" texcoord = (coord2d + 1.0) / 2.0;\n"
" texcoord = vec2(texcoord.x, 1.0-texcoord.y);\n"
"}\n"
;
#ifdef MYON_OPENGL_ES
static const char f_sh[] =
"uniform sampler2D vram;\n"
"uniform sampler2D palette;\n"
"varying mediump vec2 texcoord;\n"
"void main(void) {\n"
" mediump float index = texture2D(vram, texcoord).x;\n"
" index = index * 256.0 / 9.0;\n"
" gl_FragColor = texture2D(palette, vec2(index, 0.0));\n"
"}\n"
;
#else
static const char f_sh[] =
"uniform sampler2D vram;\n"
"uniform sampler2D palette;\n"
"varying vec2 texcoord;\n"
"void main(void) {\n"
" float index = texture2D(vram, texcoord).x;\n"
" index = index * 256.0 / 9.0;\n"
" gl_FragColor = texture2D(palette, vec2(index, 0.0));\n"
"}\n"
;
#endif
static const GLfloat triangle_vertices[] = {
-1.0, -1.0,
1.0, -1.0,
-1.0, 1.0,
1.0, 1.0
};
static GLuint create_shader(const char *shader, GLenum type) {
GLuint s = glCreateShader(type);
const char *source[2] = {sh_version, shader};
glShaderSource(s, 2, source, 0);
glCompileShader(s);
GLint ok;
glGetShaderiv(s, GL_COMPILE_STATUS, &ok);
if (!ok) {
GLint len;
glGetShaderiv(s, GL_INFO_LOG_LENGTH, &len);
if (len > 0) {
char *log = malloc(len);
if (log) {
glGetShaderInfoLog(s, len, 0, log);
printf("%s shader error: \n%s\n",
(type == GL_VERTEX_SHADER) ? "vertex" : "fragment",
log);
free(log);
}
}
glDeleteShader(s);
return 0;
}
return s;
}
struct fmdsp_gl {
struct fmdsp *fmdsp;
GLuint program;
GLint attr_coord2d;
GLint uni_vram;
GLint uni_palette;
GLint uni_xscale;
GLint uni_yscale;
GLuint tex_vram;
GLuint tex_palette;
uint8_t prev_palette[FMDSP_PALETTE_COLORS*3];
};
struct fmdsp_gl *fmdsp_gl_init(struct fmdsp *fmdsp, float xscale, float yscale) {
struct fmdsp_gl *fmdsp_gl = 0;
GLint vs = 0;
GLint fs = 0;
fmdsp_gl = malloc(sizeof(*fmdsp_gl));
if (!fmdsp_gl) goto err;
fmdsp_gl->fmdsp = fmdsp;
fmdsp_gl->program = glCreateProgram();
glGenTextures(1, &fmdsp_gl->tex_vram);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, fmdsp_gl->tex_vram);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glActiveTexture(GL_TEXTURE1);
glGenTextures(1, &fmdsp_gl->tex_palette);
glBindTexture(GL_TEXTURE_2D, fmdsp_gl->tex_palette);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
vs = create_shader(v_sh, GL_VERTEX_SHADER);
if (!vs) goto err;
fs = create_shader(f_sh, GL_FRAGMENT_SHADER);
if (!fs) goto err;
glAttachShader(fmdsp_gl->program, vs);
glAttachShader(fmdsp_gl->program, fs);
glLinkProgram(fmdsp_gl->program);
GLint ok;
glGetProgramiv(fmdsp_gl->program, GL_LINK_STATUS, &ok);
if (!ok) {
printf("link error\n");
goto err;
}
glUseProgram(fmdsp_gl->program);
fmdsp_gl->attr_coord2d = glGetAttribLocation(fmdsp_gl->program, "coord2d");
if (fmdsp_gl->attr_coord2d < 0) goto err;
fmdsp_gl->uni_vram = glGetUniformLocation(fmdsp_gl->program, "vram");
if (fmdsp_gl->uni_vram < 0) goto err;
fmdsp_gl->uni_palette = glGetUniformLocation(fmdsp_gl->program, "palette");
if (fmdsp_gl->uni_palette < 0) goto err;
fmdsp_gl->uni_xscale = glGetUniformLocation(fmdsp_gl->program, "xscale");
if (fmdsp_gl->uni_xscale < 0) goto err;
fmdsp_gl->uni_yscale = glGetUniformLocation(fmdsp_gl->program, "yscale");
if (fmdsp_gl->uni_yscale < 0) goto err;
glUniform1i(fmdsp_gl->uni_vram, 0);
glUniform1i(fmdsp_gl->uni_palette, 1);
glUniform1f(fmdsp_gl->uni_xscale, xscale);
glUniform1f(fmdsp_gl->uni_yscale, yscale);
glEnableVertexAttribArray(fmdsp_gl->attr_coord2d);
glVertexAttribPointer(fmdsp_gl->attr_coord2d,
2, GL_FLOAT, GL_FALSE, 0, triangle_vertices);
return fmdsp_gl;
err:
glDeleteShader(vs);
glDeleteShader(fs);
if (fmdsp_gl) {
glDeleteTextures(1, &fmdsp_gl->tex_vram);
glDeleteTextures(1, &fmdsp_gl->tex_palette);
glDeleteProgram(fmdsp_gl->program);
}
free(fmdsp_gl);
return 0;
}
void fmdsp_gl_render(struct fmdsp_gl *fmdsp_gl, uint8_t *vram) {
glActiveTexture(GL_TEXTURE0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, PC98_W, PC98_H, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, vram);
if (memcmp(fmdsp_gl->prev_palette, fmdsp_gl->fmdsp->palette, sizeof(fmdsp_gl->prev_palette))) {
glActiveTexture(GL_TEXTURE1);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, FMDSP_PALETTE_COLORS, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, fmdsp_gl->fmdsp->palette);
memcpy(fmdsp_gl->prev_palette, fmdsp_gl->fmdsp->palette, sizeof(fmdsp_gl->prev_palette));
}
glClear(GL_COLOR_BUFFER_BIT);
glActiveTexture(GL_TEXTURE1);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glFlush();
}
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