--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/text.c Wed Nov 15 22:51:40 2023 +0100
@@ -0,0 +1,129 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ * Copyright 2023 Mike Becker. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ascension/text.h"
+#include "ascension/context.h"
+#include "ascension/error.h"
+#include "ascension/shader.h"
+
+#include <GL/glew.h>
+
+void asc_text_draw_lb(
+ AscTextNode *node,
+ asc_vec2i position,
+ unsigned max_width,
+ cxmutstr text) {
+
+ // Generate new texture, if required
+ if (node->tex_id == 0) {
+ glGenTextures(1, &node->tex_id);
+ glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
+ glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ asc_dprintf("Generated new texture for text node: %u", node->tex_id);
+ }
+
+ // Render text onto a surface
+ SDL_Surface *surface = TTF_RenderText_Blended_Wrapped(
+ asc_context.active_font->ptr,
+ text.ptr,
+ (SDL_Color) {
+ .r = asc_context.ink.red,
+ .g = asc_context.ink.green,
+ .b = asc_context.ink.blue,
+ .a = asc_context.ink.alpha
+ },
+ max_width
+ );
+ if (surface == NULL) {
+ asc_error(SDL_GetError());
+ return;
+ }
+
+ // Store basic node information
+ node->position = position;
+ node->dimension.width = surface->w;
+ node->dimension.height = surface->h;
+
+ // Transfer Image Data
+ // TODO: move the image data transfer to a separate function - we will need it more often
+ glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format->BytesPerPixel);
+ glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA,
+ surface->w, surface->h,
+ 0, GL_BGRA, GL_UNSIGNED_BYTE, surface->pixels);
+
+ // Free the surface
+ SDL_FreeSurface(surface);
+
+ // Redraw the node
+ asc_text_redraw(node);
+}
+
+void asc_text_draw(
+ AscTextNode *node,
+ asc_vec2i position,
+ cxmutstr text) {
+ unsigned max_width = asc_context.active_window->dimensions.width - position.width;
+ asc_text_draw_lb(node, position, max_width, text);
+}
+
+void asc_text_redraw(AscTextNode *node) {
+ if (node->tex_id == 0) {
+ asc_error("Tried to redraw text node after destruction");
+ return;
+ }
+
+ glUseProgram(ASC_SHADER_FONT.base.id);
+
+ // Upload projection
+ // TODO: when we group UI draw calls, we don't need this
+ glUniformMatrix4fv(ASC_SHADER_FONT.base.projection, 1, GL_FALSE, asc_context.active_window->projection);
+
+ // Upload model matrix
+ asc_mat4f model = {0};
+ model[asc_mat4_index(0, 0)] = node->dimension.width;
+ model[asc_mat4_index(1, 1)] = node->dimension.height;
+ model[asc_mat4_index(3, 0)] = node->position.x;
+ model[asc_mat4_index(3, 1)] = node->position.y;
+ model[asc_mat4_index(3, 3)] = 1;
+ glUniformMatrix4fv(ASC_SHADER_FONT.base.model, 1, GL_FALSE, model);
+
+ // Upload surface
+ glActiveTexture(GL_TEXTURE0);
+ glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);
+ glUniform1i(ASC_SHADER_FONT.surface, 0);
+
+ // Draw mesh
+ asc_primitives_draw_plane();
+}
+
+void asc_text_destroy(AscTextNode *node) {
+ asc_dprintf("Release text node texture: %u", node->tex_id);
+ glDeleteTextures(1, &node->tex_id);
+ node->tex_id = 0;
+}
\ No newline at end of file