citrun

commit 5e284f4b138ff09ec9ceba6c2571341130f9bdf5
parent 2a76b6943e874aea6c0ba03d89471f58cb44ba74
Author: kyle <kyle@getaddrinfo.net>
Date:   Tue, 27 Oct 2015 20:16:38 -0600

viewer: initial commit

Diffstat:
A
viewer/.viewer.cpp.swp
 | 
0

A
viewer/DejaVuSansMono.ttf
 | 
0

A
viewer/Makefile
 | 
4
++++
A
viewer/vert.glsl
 | 
9
+++++++++
A
viewer/viewer.cpp
 | 
99
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

5 files changed, 112 insertions(+), 0 deletions(-)
diff --git a/viewer/.viewer.cpp.swp b/viewer/.viewer.cpp.swp
Binary files differ.
diff --git a/viewer/DejaVuSansMono.ttf b/viewer/DejaVuSansMono.ttf
Binary files differ.
diff --git a/viewer/Makefile b/viewer/Makefile
@@ -0,0 +1,4 @@
+CXXFLAGS += -I/usr/X11R6/include -I/usr/X11R6/include/freetype2
+CXXFLAGS += -I/usr/X11R6/include/libdrm
+
+viewer: viewer.o
diff --git a/viewer/vert.glsl b/viewer/vert.glsl
@@ -0,0 +1,9 @@
+#version 120
+
+attribute vec4 coord;
+varying vec2 texcoord;
+
+void main(void) {
+	gl_Position = vec4(coord.xy, 0, 1);
+	texcoord = coord.zw;
+}
diff --git a/viewer/viewer.cpp b/viewer/viewer.cpp
@@ -0,0 +1,99 @@
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include <GL/gl.h>
+#include <GL/glext.h>
+#include <GLES3/gl31.h>
+
+#include <err.h>
+
+class Text {
+public:
+	Text();
+	int draw_source_file(const char **lines);
+
+private:
+	FT_Library ft;
+	FT_Face face;
+	FT_GlyphSlot g;
+
+	void render_text(const char *, float x, float y, float sx, float sy);
+};
+
+int
+main(void)
+{
+	GLuint tex;
+	glActiveTexture(GL_TEXTURE0);
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_2D, tex);
+	glUniform1i(uniform_tex, 0);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+	GLuint vbo;
+	glGenBuffers(1, &vbo);
+	glEnableVertexAttribArray(attribute_coord);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glVertexAttribPointer(attribute_coord, 4, GL_FLOAT, GL_FALSE, 0, 0);
+
+	Text text;
+	text.draw_source_file(NULL);
+}
+
+Text::Text()
+{
+	if (FT_Init_FreeType(&ft))
+		err(1, "Could not init freetype library\n");
+
+	if (FT_New_Face(ft, "DejaVuSans.ttf", 0, &face))
+		err(1, "Could not open font\n");
+
+	FT_Set_Pixel_Sizes(face, 0, 48);
+	g = face->glyph;
+}
+
+void
+Text::render_text(const char *text, float x, float y, float sx, float sy)
+{
+	const char *p;
+
+	for (p = text; *p; p++) {
+		if (FT_Load_Char(face, *p, FT_LOAD_RENDER))
+			continue;
+
+		glTexImage2D(GL_TEXTURE_2D,
+				0,
+				GL_RED,
+				g->bitmap.width,
+				g->bitmap.rows,
+				0,
+				GL_RED,
+				GL_UNSIGNED_BYTE,
+				g->bitmap.buffer
+			    );
+
+		float x2 = x + g->bitmap_left * sx;
+		float y2 = -y - g->bitmap_top * sy;
+		float w = g->bitmap.width * sx;
+		float h = g->bitmap.rows * sy;
+
+		GLfloat box[4][4] = {
+			{x2,	-y2,		0, 0},
+			{x2 + w,	-y2,	1, 0},
+			{x2,	-y2 - h, 	0, 1},
+			{x2 + w, -y2 - h,	1, 1},
+		};
+
+		glBufferData(GL_ARRAY_BUFFER, sizeof box, box, GL_DYNAMIC_DRAW);
+		glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+		x += (g->advance.x >> 6) * sx;
+		y += (g->advance.y >> 6) * sy;
+	}
+}