comparison: src/text.c
src/text.c
- changeset 16
- c5dde81b6fb2
- parent 14
- 9dbfc0031887
- child 17
- 25013a35e07d
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| 15:362b7659dc76 | 16:c5dde81b6fb2 |
|---|---|
| 1 /* | |
| 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | |
| 3 * Copyright 2023 Mike Becker. All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * | |
| 11 * 2. Redistributions in binary form must reproduce the above copyright | |
| 12 * notice, this list of conditions and the following disclaimer in the | |
| 13 * documentation and/or other materials provided with the distribution. | |
| 14 * | |
| 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | |
| 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 * POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #include "ascension/text.h" | |
| 29 #include "ascension/context.h" | |
| 30 #include "ascension/error.h" | |
| 31 #include "ascension/shader.h" | |
| 32 | |
| 33 #include <GL/glew.h> | |
| 34 | |
| 35 void asc_text_draw_lb( | |
| 36 AscTextNode *node, | |
| 37 asc_vec2i position, | |
| 38 unsigned max_width, | |
| 39 cxmutstr text) { | |
| 40 | |
| 41 // Generate new texture, if required | |
| 42 if (node->tex_id == 0) { | |
| 43 glGenTextures(1, &node->tex_id); | |
| 44 glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id); | |
| 45 glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR); | |
| 46 glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR); | |
| 47 asc_dprintf("Generated new texture for text node: %u", node->tex_id); | |
| 48 } | |
| 49 | |
| 50 // Render text onto a surface | |
| 51 SDL_Surface *surface = TTF_RenderText_Blended_Wrapped( | |
| 52 asc_context.active_font->ptr, | |
| 53 text.ptr, | |
| 54 (SDL_Color) { | |
| 55 .r = asc_context.ink.red, | |
| 56 .g = asc_context.ink.green, | |
| 57 .b = asc_context.ink.blue, | |
| 58 .a = asc_context.ink.alpha | |
| 59 }, | |
| 60 max_width | |
| 61 ); | |
| 62 if (surface == NULL) { | |
| 63 asc_error(SDL_GetError()); | |
| 64 return; | |
| 65 } | |
| 66 | |
| 67 // Store basic node information | |
| 68 node->position = position; | |
| 69 node->dimension.width = surface->w; | |
| 70 node->dimension.height = surface->h; | |
| 71 | |
| 72 // Transfer Image Data | |
| 73 // TODO: move the image data transfer to a separate function - we will need it more often | |
| 74 glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id); | |
| 75 glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format->BytesPerPixel); | |
| 76 glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA, | |
| 77 surface->w, surface->h, | |
| 78 0, GL_BGRA, GL_UNSIGNED_BYTE, surface->pixels); | |
| 79 | |
| 80 // Free the surface | |
| 81 SDL_FreeSurface(surface); | |
| 82 | |
| 83 // Redraw the node | |
| 84 asc_text_redraw(node); | |
| 85 } | |
| 86 | |
| 87 void asc_text_draw( | |
| 88 AscTextNode *node, | |
| 89 asc_vec2i position, | |
| 90 cxmutstr text) { | |
| 91 unsigned max_width = asc_context.active_window->dimensions.width - position.width; | |
| 92 asc_text_draw_lb(node, position, max_width, text); | |
| 93 } | |
| 94 | |
| 95 void asc_text_redraw(AscTextNode *node) { | |
| 96 if (node->tex_id == 0) { | |
| 97 asc_error("Tried to redraw text node after destruction"); | |
| 98 return; | |
| 99 } | |
| 100 | |
| 101 glUseProgram(ASC_SHADER_FONT.base.id); | |
| 102 | |
| 103 // Upload projection | |
| 104 // TODO: when we group UI draw calls, we don't need this | |
| 105 glUniformMatrix4fv(ASC_SHADER_FONT.base.projection, 1, GL_FALSE, asc_context.active_window->projection); | |
| 106 | |
| 107 // Upload model matrix | |
| 108 asc_mat4f model = {0}; | |
| 109 model[asc_mat4_index(0, 0)] = node->dimension.width; | |
| 110 model[asc_mat4_index(1, 1)] = node->dimension.height; | |
| 111 model[asc_mat4_index(3, 0)] = node->position.x; | |
| 112 model[asc_mat4_index(3, 1)] = node->position.y; | |
| 113 model[asc_mat4_index(3, 3)] = 1; | |
| 114 glUniformMatrix4fv(ASC_SHADER_FONT.base.model, 1, GL_FALSE, model); | |
| 115 | |
| 116 // Upload surface | |
| 117 glActiveTexture(GL_TEXTURE0); | |
| 118 glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id); | |
| 119 glUniform1i(ASC_SHADER_FONT.surface, 0); | |
| 120 | |
| 121 // Draw mesh | |
| 122 asc_primitives_draw_plane(); | |
| 123 } | |
| 124 | |
| 125 void asc_text_destroy(AscTextNode *node) { | |
| 126 asc_dprintf("Release text node texture: %u", node->tex_id); | |
| 127 glDeleteTextures(1, &node->tex_id); | |
| 128 node->tex_id = 0; | |
| 129 } |
