From: David Gow <david@ingeniumdigital.com>
Date: Tue, 17 Jun 2014 02:14:44 +0000 (+0800)
Subject: Fix RenderPixels, CPU rendering "works"
X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=commitdiff_plain;h=8942bd699d8e1ddede1127421ad18bed53232ff3;hp=cfe7da763b5d8ef4252ddb94558abb080bbd893d

Fix RenderPixels, CPU rendering "works"
---

diff --git a/bin/ipdf b/bin/ipdf
index 1d17b2d..d536a81 100755
Binary files a/bin/ipdf and b/bin/ipdf differ
diff --git a/src/ipdf.h b/src/ipdf.h
index 5a4f35c..211f2c3 100644
--- a/src/ipdf.h
+++ b/src/ipdf.h
@@ -22,9 +22,9 @@ namespace IPDF
 	 */
 	typedef enum 
 	{
-		RECT_FILLED = 0,
+		CIRCLE_FILLED = 0, 
+		RECT_FILLED,
 		RECT_OUTLINE,
-		CIRCLE_FILLED, 
 		NUMBER_OF_OBJECT_TYPES
 	} ObjectType;
 
diff --git a/src/screen.cpp b/src/screen.cpp
index 08e4a26..dc59de9 100644
--- a/src/screen.cpp
+++ b/src/screen.cpp
@@ -76,7 +76,13 @@ Screen::Screen()
 	GLint texture_uniform_location = m_texture_prog.GetUniformLocation("tex");
 	glUniform1i(texture_uniform_location, 0);
 
-	m_colour_uniform_location = m_texture_prog.GetUniformLocation("colour");
+	m_font_prog.InitialiseShaders(BASICTEX_VERT, "shaders/fonttex_frag.glsl");
+	m_font_prog.Use();
+
+	// We always want to use the texture bound to texture unit 0.
+	GLint font_texture_uniform_location = m_font_prog.GetUniformLocation("tex");
+	glUniform1i(font_texture_uniform_location, 0);
+	m_colour_uniform_location = m_font_prog.GetUniformLocation("colour");
 
 	m_viewport_ubo.SetUsage(GraphicsBuffer::BufferUsageDynamicDraw);
 	m_viewport_ubo.SetType(GraphicsBuffer::BufferTypeUniform);
@@ -228,8 +234,8 @@ void Screen::RenderPixels(int x, int y, int w, int h, uint8_t *pixels) const
 	GLfloat quad[] = { 
 		0, 0, (float)x, (float)y,
 		1, 0, (float)(x+w), (float)y,
-		1, 1, (float)(x+w), (float)(y+h),
-		0, 1, (float)x, (float)(y+h)
+		0, 1, (float)x, (float)(y+h),
+		1, 1, (float)(x+w), (float)(y+h)
 	};
 	quad_vertex_buffer.Upload(sizeof(GLfloat) * 16, quad);
 	quad_vertex_buffer.Bind();
@@ -246,15 +252,15 @@ void Screen::RenderPixels(int x, int y, int w, int h, uint8_t *pixels) const
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 
-	glTexImage2D(GL_TEXTURE_2D, 0, 4, w, h, 0, texture_format, GL_UNSIGNED_BYTE, pixels);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, texture_format, GL_UNSIGNED_BYTE, pixels);
 
 	glEnableVertexAttribArray(0);
 	glEnableVertexAttribArray(1);
 	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (void*)(2*sizeof(float)));
 	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 	glDisableVertexAttribArray(1);
 	glDisableVertexAttribArray(0);
-	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 
 }
 
@@ -408,7 +414,7 @@ void Screen::DebugFontFlush()
 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
 
-	m_texture_prog.Use();
+	m_font_prog.Use();
 	m_viewport_ubo.Bind();
 	m_debug_font_vertices.Bind();
 	m_debug_font_indices.Bind();
diff --git a/src/screen.h b/src/screen.h
index c76a554..a034d2a 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -84,6 +84,7 @@ namespace IPDF
 		SDL_Window *m_window;
 		SDL_GLContext m_gl_context;
 		ShaderProgram m_texture_prog;
+		ShaderProgram m_font_prog;
 		GLint m_colour_uniform_location;
 		GraphicsBuffer m_viewport_ubo;
 		stbtt_bakedchar m_debug_font_rects[96];
diff --git a/src/shaders/basictex_frag.glsl b/src/shaders/basictex_frag.glsl
index 534ff02..b7dfe19 100644
--- a/src/shaders/basictex_frag.glsl
+++ b/src/shaders/basictex_frag.glsl
@@ -9,7 +9,6 @@ uniform vec4 colour;
 
 void main()
 {
-	output_colour = colour;
-	output_colour.a = texture(tex, fp_tex_coord).r;
+	output_colour = texture(tex, fp_tex_coord) * colour;
 }
 
diff --git a/src/shaders/fonttex_frag.glsl b/src/shaders/fonttex_frag.glsl
new file mode 100644
index 0000000..534ff02
--- /dev/null
+++ b/src/shaders/fonttex_frag.glsl
@@ -0,0 +1,15 @@
+#version 140
+
+in vec2 fp_tex_coord;
+
+out vec4 output_colour;
+
+uniform sampler2D tex;
+uniform vec4 colour;
+
+void main()
+{
+	output_colour = colour;
+	output_colour.a = texture(tex, fp_tex_coord).r;
+}
+