From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Sun, 19 Jan 2014 13:47:22 +0000 (+0100)
Subject: added texture support
X-Git-Url: http://git.localhorst.tv/?p=gworm.git;a=commitdiff_plain;h=ba1cd7abc93eaacc3c25c0ad1b923b2ce7b280e2

added texture support
---

diff --git a/src/graphics/Canvas.cpp b/src/graphics/Canvas.cpp
index b461ab4..beabd01 100644
--- a/src/graphics/Canvas.cpp
+++ b/src/graphics/Canvas.cpp
@@ -45,6 +45,16 @@ Vector<int> Canvas::Size() const {
 }
 
 
+Texture Canvas::CreateStaticTexture(Vector<int> size) {
+	return Texture(canv, Color::Format, SDL_TEXTUREACCESS_STATIC, size);
+}
+
+
+void Canvas::Copy(Texture &tex, Vector<int> to) {
+	tex.Copy(canv, to);
+}
+
+
 void Canvas::SetColor(Color c) {
 	SDL_SetRenderDrawColor(canv, c.r, c.g, c.b, c.a);
 }
diff --git a/src/graphics/Canvas.h b/src/graphics/Canvas.h
index b464dd6..16d565d 100644
--- a/src/graphics/Canvas.h
+++ b/src/graphics/Canvas.h
@@ -2,6 +2,7 @@
 #define GWORM_CANVAS_H_
 
 #include "Color.h"
+#include "Texture.h"
 #include "Vector.h"
 
 #include <SDL.h>
@@ -27,6 +28,10 @@ public:
 
 	void Present();
 
+	Texture CreateStaticTexture(Vector<int> size);
+
+	void Copy(Texture &, Vector<int> to);
+
 	void SetColor(Color);
 
 	void Fill();
diff --git a/src/graphics/Color.h b/src/graphics/Color.h
index f976e1a..ade711c 100644
--- a/src/graphics/Color.h
+++ b/src/graphics/Color.h
@@ -8,6 +8,9 @@ namespace gworm {
 
 struct Color {
 
+	// NOTE: this depends on endianness and should be defined accordingly
+	static constexpr Uint32 Format = SDL_PIXELFORMAT_ABGR8888;
+
 	constexpr Color()
 	: Color(0, 0, 0) { }
 	constexpr Color(Uint8 r, Uint8 g, Uint8 b, Uint8 a = 0xFF)
diff --git a/src/graphics/Rect.h b/src/graphics/Rect.h
new file mode 100644
index 0000000..7cef9d1
--- /dev/null
+++ b/src/graphics/Rect.h
@@ -0,0 +1,50 @@
+#ifndef GWORM_RECT_H_
+#define GWORM_RECT_H_
+
+#include "Vector.h"
+
+#include <SDL.h>
+
+
+namespace gworm {
+
+template<class Scalar>
+class Rect {
+
+public:
+	constexpr Rect() : x(0), y(0), w(0), h(0) { }
+	constexpr Rect(Vector<Scalar> pos, Vector<Scalar> size)
+	: x(pos.x), y(pos.y), w(size.x), h(size.y) { }
+
+public:
+	constexpr Vector<Scalar> Pos() const { return Vector<Scalar>(x, y); }
+	constexpr Vector<Scalar> Size() const { return Vector<Scalar>(w, h); }
+
+public:
+	Scalar x;
+	Scalar y;
+	Scalar w;
+	Scalar h;
+
+};
+
+
+/// specialization with same layout as SDL_Rect
+template<>
+class Rect<int>
+: public SDL_Rect {
+
+public:
+	constexpr Rect() : SDL_Rect({0, 0, 0, 0}) { }
+	constexpr Rect(Vector<int> pos, Vector<int> size)
+	: SDL_Rect({pos.x, pos.y, size.x, size.y}) { }
+
+public:
+	constexpr Vector<int> Pos() const { return Vector<int>(x, y); }
+	constexpr Vector<int> Size() const { return Vector<int>(w, h); }
+
+};
+
+}
+
+#endif
diff --git a/src/graphics/Texture.cpp b/src/graphics/Texture.cpp
new file mode 100644
index 0000000..f39d1ca
--- /dev/null
+++ b/src/graphics/Texture.cpp
@@ -0,0 +1,69 @@
+#include "Texture.h"
+
+
+namespace gworm {
+
+Texture::Texture()
+: tex(nullptr)
+, format(Color::Format)
+, size(0, 0) {
+
+}
+
+Texture::~Texture() {
+	if (tex) SDL_DestroyTexture(tex);
+}
+
+Texture::Texture(Texture &&other)
+: Texture() {
+	Swap(other);
+}
+
+Texture &Texture::operator =(Texture &&other) {
+	Texture temp(std::move(other));
+	Swap(temp);
+	return *this;
+}
+
+
+Texture::Texture(
+	SDL_Renderer *c,
+	Uint32 f,
+	int u,
+	Vector<int> s)
+: tex(SDL_CreateTexture(c, f, u, s.x, s.y))
+, format(f)
+, size(s) {
+
+}
+
+
+void Texture::Swap(Texture &other) {
+	std::swap(tex, other.tex);
+	std::swap(format, other.format);
+	std::swap(size, other.size);
+}
+
+
+void Texture::SetColors(const Color *values) {
+	if (format == Color::Format) {
+		SDL_UpdateTexture(tex, nullptr, values, Size().x * sizeof(Color));
+	} else {
+		// TODO: implement for non-Color pixel formats
+	}
+}
+
+
+void Texture::Fill(SDL_Renderer *canv) {
+	SDL_RenderCopy(canv, tex, nullptr, nullptr);
+}
+
+void Texture::Copy(SDL_Renderer *canv, Vector<int> to) {
+	Copy(canv, Rect<int>(to, Size()));
+}
+
+void Texture::Copy(SDL_Renderer *canv, Rect<int> to) {
+	SDL_RenderCopy(canv, tex, nullptr, &to);
+}
+
+}
diff --git a/src/graphics/Texture.h b/src/graphics/Texture.h
new file mode 100644
index 0000000..a4985bc
--- /dev/null
+++ b/src/graphics/Texture.h
@@ -0,0 +1,63 @@
+#ifndef GWORM_TEXTURE_H_
+#define GWORM_TEXTURE_H_
+
+#include "Color.h"
+#include "Rect.h"
+#include "Vector.h"
+
+#include <algorithm>
+#include <SDL.h>
+
+
+namespace gworm {
+
+class Texture {
+
+public:
+	Texture();
+	~Texture();
+
+	Texture(Texture &&);
+	Texture &operator =(Texture &&);
+
+	Texture(const Texture &) = delete;
+	Texture &operator =(const Texture &) = delete;
+
+	Texture(SDL_Renderer *, Uint32 format, int use, Vector<int> size);
+
+	void Swap(Texture &);
+
+public:
+	Vector<int> Size() const { return size; }
+
+	/// stretch this texture to completely fill given render target
+	void Fill(SDL_Renderer *);
+	/// copy entire texture as is to given coordinates
+	void Copy(SDL_Renderer *, Vector<int> to);
+	/// copy entire texture stretched to given rect
+	void Copy(SDL_Renderer *, Rect<int> to);
+
+	/// set all color values
+	/// given array must hold at least Size().x * Size().y values
+	void SetColors(const Color *);
+
+private:
+	SDL_Texture *tex;
+	Uint32 format;
+	Vector<int> size;
+
+};
+
+}
+
+
+namespace std {
+
+template<>
+inline void swap<gworm::Texture>(gworm::Texture &lhs, gworm::Texture &rhs) {
+	lhs.Swap(rhs);
+}
+
+}
+
+#endif