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annotate DPF-Prymula-audioplugins/dpf/dgl/src/nanovg/nanovg_gl_utils.h @ 6:542e305f23f4

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arkanoid-trix-debian-dir
author prymula <prymula76@outlook.com>
date Wed, 31 Jan 2024 20:40:57 +0100
parents 84e66ea83026
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
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1 //
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2 // Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
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3 //
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4 // This software is provided 'as-is', without any express or implied
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5 // warranty. In no event will the authors be held liable for any damages
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6 // arising from the use of this software.
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7 // Permission is granted to anyone to use this software for any purpose,
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8 // including commercial applications, and to alter it and redistribute it
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9 // freely, subject to the following restrictions:
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10 // 1. The origin of this software must not be misrepresented; you must not
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11 // claim that you wrote the original software. If you use this software
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12 // in a product, an acknowledgment in the product documentation would be
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13 // appreciated but is not required.
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14 // 2. Altered source versions must be plainly marked as such, and must not be
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15 // misrepresented as being the original software.
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16 // 3. This notice may not be removed or altered from any source distribution.
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17 //
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18 #ifndef NANOVG_GL_UTILS_H
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19 #define NANOVG_GL_UTILS_H
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20
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21 struct NVGLUframebuffer {
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22 NVGcontext* ctx;
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23 GLuint fbo;
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24 GLuint rbo;
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25 GLuint texture;
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26 int image;
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27 };
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28 typedef struct NVGLUframebuffer NVGLUframebuffer;
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29
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30 // Helper function to create GL frame buffer to render to.
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31 void nvgluBindFramebuffer(NVGLUframebuffer* fb);
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32 NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imageFlags);
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33 void nvgluDeleteFramebuffer(NVGLUframebuffer* fb);
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34
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35 #endif // NANOVG_GL_UTILS_H
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36
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37 #ifdef NANOVG_GL_IMPLEMENTATION
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38
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39 #if defined(NANOVG_GL3) || defined(NANOVG_GLES2) || defined(NANOVG_GLES3)
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40 // FBO is core in OpenGL 3>.
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41 # define NANOVG_FBO_VALID 1
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42 #elif defined(NANOVG_GL2)
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43 // On OS X including glext defines FBO on GL2 too.
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44 # ifdef __APPLE__
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45 # include <OpenGL/glext.h>
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46 # define NANOVG_FBO_VALID 1
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47 # endif
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48 #endif
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49
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50 static GLint defaultFBO = -1;
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51
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52 NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imageFlags)
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53 {
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54 #ifdef NANOVG_FBO_VALID
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55 GLint defaultFBO;
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56 GLint defaultRBO;
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57 NVGLUframebuffer* fb = NULL;
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58
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59 glGetIntegerv(GL_FRAMEBUFFER_BINDING, &defaultFBO);
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60 glGetIntegerv(GL_RENDERBUFFER_BINDING, &defaultRBO);
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61
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62 fb = (NVGLUframebuffer*)malloc(sizeof(NVGLUframebuffer));
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63 if (fb == NULL) goto error;
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64 memset(fb, 0, sizeof(NVGLUframebuffer));
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65
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66 fb->image = nvgCreateImageRGBA(ctx, w, h, imageFlags | NVG_IMAGE_FLIPY | NVG_IMAGE_PREMULTIPLIED, NULL);
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67
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68 #if defined NANOVG_GL2
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69 fb->texture = nvglImageHandleGL2(ctx, fb->image);
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70 #elif defined NANOVG_GL3
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71 fb->texture = nvglImageHandleGL3(ctx, fb->image);
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72 #elif defined NANOVG_GLES2
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73 fb->texture = nvglImageHandleGLES2(ctx, fb->image);
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74 #elif defined NANOVG_GLES3
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75 fb->texture = nvglImageHandleGLES3(ctx, fb->image);
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76 #endif
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77
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78 fb->ctx = ctx;
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79
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80 // frame buffer object
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81 glGenFramebuffers(1, &fb->fbo);
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82 glBindFramebuffer(GL_FRAMEBUFFER, fb->fbo);
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83
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84 // render buffer object
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85 glGenRenderbuffers(1, &fb->rbo);
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86 glBindRenderbuffer(GL_RENDERBUFFER, fb->rbo);
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87 glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, w, h);
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88
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89 // combine all
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90 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb->texture, 0);
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91 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fb->rbo);
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92
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93 if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
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94 #ifdef GL_DEPTH24_STENCIL8
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95 // If GL_STENCIL_INDEX8 is not supported, try GL_DEPTH24_STENCIL8 as a fallback.
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96 // Some graphics cards require a depth buffer along with a stencil.
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97 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, w, h);
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98 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb->texture, 0);
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99 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fb->rbo);
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100
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101 if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
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102 #endif // GL_DEPTH24_STENCIL8
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103 goto error;
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104 }
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105
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106 glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
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107 glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO);
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108 return fb;
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109 error:
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110 glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
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111 glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO);
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112 nvgluDeleteFramebuffer(fb);
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113 return NULL;
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114 #else
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115 NVG_NOTUSED(ctx);
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116 NVG_NOTUSED(w);
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117 NVG_NOTUSED(h);
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118 NVG_NOTUSED(imageFlags);
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119 return NULL;
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120 #endif
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121 }
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122
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prymula <prymula76@outlook.com>
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123 void nvgluBindFramebuffer(NVGLUframebuffer* fb)
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124 {
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125 #ifdef NANOVG_FBO_VALID
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126 if (defaultFBO == -1) glGetIntegerv(GL_FRAMEBUFFER_BINDING, &defaultFBO);
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127 glBindFramebuffer(GL_FRAMEBUFFER, fb != NULL ? fb->fbo : defaultFBO);
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128 #else
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129 NVG_NOTUSED(fb);
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130 #endif
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131 }
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132
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133 void nvgluDeleteFramebuffer(NVGLUframebuffer* fb)
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134 {
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135 #ifdef NANOVG_FBO_VALID
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136 if (fb == NULL) return;
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prymula <prymula76@outlook.com>
parents:
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137 if (fb->fbo != 0)
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parents:
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138 glDeleteFramebuffers(1, &fb->fbo);
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prymula <prymula76@outlook.com>
parents:
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139 if (fb->rbo != 0)
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prymula <prymula76@outlook.com>
parents:
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140 glDeleteRenderbuffers(1, &fb->rbo);
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prymula <prymula76@outlook.com>
parents:
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141 if (fb->image >= 0)
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prymula <prymula76@outlook.com>
parents:
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142 nvgDeleteImage(fb->ctx, fb->image);
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prymula <prymula76@outlook.com>
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143 fb->ctx = NULL;
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prymula <prymula76@outlook.com>
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144 fb->fbo = 0;
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parents:
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145 fb->rbo = 0;
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prymula <prymula76@outlook.com>
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146 fb->texture = 0;
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prymula <prymula76@outlook.com>
parents:
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147 fb->image = -1;
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prymula <prymula76@outlook.com>
parents:
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148 free(fb);
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prymula <prymula76@outlook.com>
parents:
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149 #else
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parents:
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150 NVG_NOTUSED(fb);
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prymula <prymula76@outlook.com>
parents:
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151 #endif
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prymula <prymula76@outlook.com>
parents:
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152 }
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prymula <prymula76@outlook.com>
parents:
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153
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parents:
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154 #endif // NANOVG_GL_IMPLEMENTATION