src/text.c

Thu, 21 Mar 2024 20:48:18 +0100

author
Mike Becker <universe@uap-core.de>
date
Thu, 21 Mar 2024 20:48:18 +0100
changeset 40
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parent 38
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child 41
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permissions
-rw-r--r--

rename font shader to generic sprite shader

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 * Copyright 2023 Mike Becker. All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
1efd6da2ad53 add datatypes.h
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6 * modification, are permitted provided that the following conditions are met:
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7 *
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 *
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11 * 2. Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 * POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 #include "ascension/text.h"
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29 #include "ascension/context.h"
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30 #include "ascension/error.h"
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31 #include "ascension/shader.h"
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32
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33 #include <GL/glew.h>
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34
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35 static void asc_text_draw(AscText const *node) {
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36 if (node->color.alpha == 0 || node->hidden || node->tex_id == 0) {
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37 return;
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38 }
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39
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40 // Upload model matrix
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41 glUniformMatrix4fv(ASC_SHADER_SPRITE.base.model, 1,
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42 GL_FALSE, node->base.final_transform);
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43
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44 // Upload surface
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45 glActiveTexture(GL_TEXTURE0);
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46 glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
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47 glUniform1i(ASC_SHADER_SPRITE.surface, 0);
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48
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49 // Draw mesh
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50 asc_primitives_draw_plane();
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51 }
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52
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53 static void asc_text_update_transform(AscText *node) {
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54 asc_transform_scale2i(node->base.local_transform, node->dimension);
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55 asc_transform_translate2i(node->base.world_transform, node->position);
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56 }
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57
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58 static void asc_text_update(AscText *node) {
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59 // short circuit if fully transparent or hidden, we don't need anything
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60 if (node->color.alpha == 0 || node->hidden) {
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61 return;
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62 }
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63
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64 // Generate new texture, if required
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65 if (node->tex_id == 0) {
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66 glGenTextures(1, &node->tex_id);
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67 glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
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68 glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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69 glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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70 asc_dprintf("Generated new texture for text node: %u", node->tex_id);
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71 }
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72
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73 // Render text onto a surface
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74 SDL_Surface *surface = TTF_RenderUTF8_Blended_Wrapped(
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75 asc_font_cache_validate(node->font)->ptr,
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76 node->text,
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77 asc_col_sdl(node->color),
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78 node->max_width
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79 );
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80 if (surface == NULL) {
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81 asc_error(SDL_GetError());
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82 return;
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83 }
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84 node->dimension.width = surface->w;
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85 node->dimension.height = surface->h;
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86 asc_node_update_transform(node);
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87
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88 // Transfer Image Data
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89 // TODO: move the image data transfer to a separate function - we will need it more often
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90 glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
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91 glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format->BytesPerPixel);
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92 glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA,
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93 surface->w, surface->h,
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94 0, GL_BGRA, GL_UNSIGNED_BYTE, surface->pixels);
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95
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96 // Free the surface
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97 SDL_FreeSurface(surface);
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98 }
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99
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100 AscSceneNode *asc_text(int x, int y, char const *text) {
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101 AscText *node = calloc(1, sizeof(AscText));
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102 if (node == NULL) {
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103 asc_error("Out of memory.");
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104 return NULL;
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105 }
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106
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107 node->base.render_group = ASC_RENDER_GROUP_FONTS;
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108 node->base.free_func = (asc_scene_free_func) asc_text_free;
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109 node->base.update_func = (asc_scene_update_func) asc_text_update;
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110 node->base.transform_update_func = (asc_scene_update_func) asc_text_update_transform;
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111 node->base.draw_func = (asc_scene_draw_func) asc_text_draw;
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112
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113 node->position.x = x;
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114 node->position.y = y;
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115 node->font = asc_context.active_font;
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116 node->color = asc_context.ink;
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117 if (text != NULL) {
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118 node->text = strdup(text);
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119 }
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120
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121 // initialize
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122 asc_text_update(node);
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123 asc_text_update_transform(node);
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124
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125 return &node->base;
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126 }
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127
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128 void asc_text_free(AscText *node) {
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129 asc_dprintf("Release text node texture: %u", node->tex_id);
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130 glDeleteTextures(1, &node->tex_id);
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131 free(node->text);
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132 free(node);
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133 }

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