diff options
Diffstat (limited to 'opengl.c')
| -rw-r--r-- | opengl.c | 88 |
1 files changed, 61 insertions, 27 deletions
@@ -191,28 +191,60 @@ bool glx_init_blur(session_t *ps) { #ifdef CONFIG_VSYNC_OPENGL_GLSL // Build shader - static const char *FRAG_SHADER_BLUR = - "#version 110\n" - "uniform float offset_x;\n" - "uniform float offset_y;\n" - "uniform float factor_center;\n" - "uniform sampler2D tex_scr;\n" - "\n" - "void main() {\n" - " vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x - offset_x, gl_TexCoord[0].y - offset_y));\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x - offset_x, gl_TexCoord[0].y));\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x - offset_x, gl_TexCoord[0].y + offset_y));\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x, gl_TexCoord[0].y - offset_y));\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x, gl_TexCoord[0].y)) * factor_center;\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x, gl_TexCoord[0].y + offset_y));\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x + offset_x, gl_TexCoord[0].y - offset_y));\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x + offset_x, gl_TexCoord[0].y));\n" - " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x + offset_x, gl_TexCoord[0].y + offset_y));\n" - " gl_FragColor = sum / (factor_center + 8.0);\n" - "}\n" - ; - ps->glx_frag_shader_blur = glx_create_shader(GL_FRAGMENT_SHADER, FRAG_SHADER_BLUR); + { + static const char *FRAG_SHADER_BLUR_PREFIX = + "#version 110\n" + "uniform float offset_x;\n" + "uniform float offset_y;\n" + "uniform float factor_center;\n" + "uniform sampler2D tex_scr;\n" + "\n" + "void main() {\n" + " vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);\n"; + static const char *FRAG_SHADER_BLUR_ADD = + " sum += float(%.7g) * texture2D(tex_scr, vec2(gl_TexCoord[0].x + offset_x * float(%d), gl_TexCoord[0].y + offset_y * float(%d)));\n"; + static const char *FRAG_SHADER_BLUR_SUFFIX = + " sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x, gl_TexCoord[0].y)) * factor_center;\n" + " gl_FragColor = sum / (factor_center + float(%.7g));\n" + "}\n"; + int wid = XFixedToDouble(ps->o.blur_kern[0]), hei = XFixedToDouble(ps->o.blur_kern[1]); + int nele = wid * hei - 1; + int len = strlen(FRAG_SHADER_BLUR_PREFIX) + (strlen(FRAG_SHADER_BLUR_ADD) + 42) * nele + + strlen(FRAG_SHADER_BLUR_SUFFIX) + 12 + 1; + char *shader_str = calloc(len, sizeof(char)); + if (!shader_str) { + printf_errf("(): Failed to allocate %d bytes for shader string.", len); + return false; + } + { + char *pc = shader_str; + strcpy(pc, FRAG_SHADER_BLUR_PREFIX); + pc += strlen(FRAG_SHADER_BLUR_PREFIX); + assert(strlen(shader_str) < len); + + double sum = 0.0; + for (int i = 0; i < hei; ++i) { + for (int j = 0; j < wid; ++j) { + if (hei / 2 == i && wid / 2 == j) + continue; + double val = XFixedToDouble(ps->o.blur_kern[2 + i * wid + j]); + sum += val; + sprintf(pc, FRAG_SHADER_BLUR_ADD, val, j - wid / 2, i - hei / 2); + pc += strlen(pc); + assert(strlen(shader_str) < len); + } + } + + sprintf(pc, FRAG_SHADER_BLUR_SUFFIX, sum); + assert(strlen(shader_str) < len); +#ifdef DEBUG_GLX_GLSL + fputs(shader_str, stdout); + fflush(stdout); +#endif + } + ps->glx_frag_shader_blur = glx_create_shader(GL_FRAGMENT_SHADER, shader_str); + } + if (!ps->glx_frag_shader_blur) { printf_errf("(): Failed to create fragment shader."); return false; @@ -227,8 +259,7 @@ glx_init_blur(session_t *ps) { #define P_GET_UNIFM_LOC(name, target) { \ ps->target = glGetUniformLocation(ps->glx_prog_blur, name); \ if (ps->target < 0) { \ - printf_errf("(): Failed to get location of uniform '" name "'."); \ - return false; \ + printf_errf("(): Failed to get location of uniform '" name "'. Might be troublesome."); \ } \ } @@ -759,9 +790,12 @@ glx_blur_dst(session_t *ps, int dx, int dy, int width, int height, float z, glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); #ifdef CONFIG_VSYNC_OPENGL_GLSL glUseProgram(ps->glx_prog_blur); - glUniform1f(ps->glx_prog_blur_unifm_offset_x, 1.0f / width); - glUniform1f(ps->glx_prog_blur_unifm_offset_y, 1.0f / height); - glUniform1f(ps->glx_prog_blur_unifm_factor_center, factor_center); + if (ps->glx_prog_blur_unifm_offset_x >= 0) + glUniform1f(ps->glx_prog_blur_unifm_offset_x, 1.0f / width); + if (ps->glx_prog_blur_unifm_offset_y >= 0) + glUniform1f(ps->glx_prog_blur_unifm_offset_y, 1.0f / height); + if (ps->glx_prog_blur_unifm_factor_center >= 0) + glUniform1f(ps->glx_prog_blur_unifm_factor_center, factor_center); #endif { |