diff options
| -rw-r--r-- | fmdsp/fmdsp_gl.c | 177 | ||||
| -rw-r--r-- | fmdsp/fmdsp_gl.h | 11 |
2 files changed, 188 insertions, 0 deletions
diff --git a/fmdsp/fmdsp_gl.c b/fmdsp/fmdsp_gl.c new file mode 100644 index 0000000..7f62a60 --- /dev/null +++ b/fmdsp/fmdsp_gl.c @@ -0,0 +1,177 @@ +// 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(); +} diff --git a/fmdsp/fmdsp_gl.h b/fmdsp/fmdsp_gl.h new file mode 100644 index 0000000..e279b61 --- /dev/null +++ b/fmdsp/fmdsp_gl.h @@ -0,0 +1,11 @@ +#ifndef MYON_FMDSP_GL_H_INCLUDED +#define MYON_FMDSP_GL_H_INCLUDED + +#include "fmdsp/fmdsp.h" + +struct fmdsp_gl; + +struct fmdsp_gl *fmdsp_gl_init(struct fmdsp *fmdsp, float xscale, float yscale); +void fmdsp_gl_render(struct fmdsp_gl *fmdsp_gl, uint8_t *vram); + +#endif // MYON_FMDSP_GL_H_INCLUDED |