1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/text.c Wed Nov 15 22:51:40 2023 +0100
1.3 @@ -0,0 +1,129 @@
1.4 +/*
1.5 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
1.6 + * Copyright 2023 Mike Becker. All rights reserved.
1.7 + *
1.8 + * Redistribution and use in source and binary forms, with or without
1.9 + * modification, are permitted provided that the following conditions are met:
1.10 + *
1.11 + * 1. Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + *
1.14 + * 2. Redistributions in binary form must reproduce the above copyright
1.15 + * notice, this list of conditions and the following disclaimer in the
1.16 + * documentation and/or other materials provided with the distribution.
1.17 + *
1.18 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
1.22 + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 + * POSSIBILITY OF SUCH DAMAGE.
1.29 + */
1.30 +
1.31 +#include "ascension/text.h"
1.32 +#include "ascension/context.h"
1.33 +#include "ascension/error.h"
1.34 +#include "ascension/shader.h"
1.35 +
1.36 +#include <GL/glew.h>
1.37 +
1.38 +void asc_text_draw_lb(
1.39 + AscTextNode *node,
1.40 + asc_vec2i position,
1.41 + unsigned max_width,
1.42 + cxmutstr text) {
1.43 +
1.44 + // Generate new texture, if required
1.45 + if (node->tex_id == 0) {
1.46 + glGenTextures(1, &node->tex_id);
1.47 + glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
1.48 + glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1.49 + glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
1.50 + asc_dprintf("Generated new texture for text node: %u", node->tex_id);
1.51 + }
1.52 +
1.53 + // Render text onto a surface
1.54 + SDL_Surface *surface = TTF_RenderText_Blended_Wrapped(
1.55 + asc_context.active_font->ptr,
1.56 + text.ptr,
1.57 + (SDL_Color) {
1.58 + .r = asc_context.ink.red,
1.59 + .g = asc_context.ink.green,
1.60 + .b = asc_context.ink.blue,
1.61 + .a = asc_context.ink.alpha
1.62 + },
1.63 + max_width
1.64 + );
1.65 + if (surface == NULL) {
1.66 + asc_error(SDL_GetError());
1.67 + return;
1.68 + }
1.69 +
1.70 + // Store basic node information
1.71 + node->position = position;
1.72 + node->dimension.width = surface->w;
1.73 + node->dimension.height = surface->h;
1.74 +
1.75 + // Transfer Image Data
1.76 + // TODO: move the image data transfer to a separate function - we will need it more often
1.77 + glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
1.78 + glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format->BytesPerPixel);
1.79 + glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA,
1.80 + surface->w, surface->h,
1.81 + 0, GL_BGRA, GL_UNSIGNED_BYTE, surface->pixels);
1.82 +
1.83 + // Free the surface
1.84 + SDL_FreeSurface(surface);
1.85 +
1.86 + // Redraw the node
1.87 + asc_text_redraw(node);
1.88 +}
1.89 +
1.90 +void asc_text_draw(
1.91 + AscTextNode *node,
1.92 + asc_vec2i position,
1.93 + cxmutstr text) {
1.94 + unsigned max_width = asc_context.active_window->dimensions.width - position.width;
1.95 + asc_text_draw_lb(node, position, max_width, text);
1.96 +}
1.97 +
1.98 +void asc_text_redraw(AscTextNode *node) {
1.99 + if (node->tex_id == 0) {
1.100 + asc_error("Tried to redraw text node after destruction");
1.101 + return;
1.102 + }
1.103 +
1.104 + glUseProgram(ASC_SHADER_FONT.base.id);
1.105 +
1.106 + // Upload projection
1.107 + // TODO: when we group UI draw calls, we don't need this
1.108 + glUniformMatrix4fv(ASC_SHADER_FONT.base.projection, 1, GL_FALSE, asc_context.active_window->projection);
1.109 +
1.110 + // Upload model matrix
1.111 + asc_mat4f model = {0};
1.112 + model[asc_mat4_index(0, 0)] = node->dimension.width;
1.113 + model[asc_mat4_index(1, 1)] = node->dimension.height;
1.114 + model[asc_mat4_index(3, 0)] = node->position.x;
1.115 + model[asc_mat4_index(3, 1)] = node->position.y;
1.116 + model[asc_mat4_index(3, 3)] = 1;
1.117 + glUniformMatrix4fv(ASC_SHADER_FONT.base.model, 1, GL_FALSE, model);
1.118 +
1.119 + // Upload surface
1.120 + glActiveTexture(GL_TEXTURE0);
1.121 + glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
1.122 + glUniform1i(ASC_SHADER_FONT.surface, 0);
1.123 +
1.124 + // Draw mesh
1.125 + asc_primitives_draw_plane();
1.126 +}
1.127 +
1.128 +void asc_text_destroy(AscTextNode *node) {
1.129 + asc_dprintf("Release text node texture: %u", node->tex_id);
1.130 + glDeleteTextures(1, &node->tex_id);
1.131 + node->tex_id = 0;
1.132 +}
1.133 \ No newline at end of file
